Implantable medical device for lubricating an artificial contacting surface

ABSTRACT

An implantable medical device for implantation in a mammal joint having at least two contacting surfaces is provided. The medical device comprises; an artificial contacting surface adapted to replace at least the surface of at least one of the mammal&#39;s joint contacting surfaces, wherein the artificial contacting surface is adapted to be lubricated, when implanted in said joint. Furthermore the medical device comprises at least one inlet adapted to receive a lubricating fluid from a reservoir, at least one channel at least partly integrated in the artificial contacting surface in connection with the at least one inlet for distributing the lubricating fluid to the surface of the artificial contacting surface. The medical device could be adapted to be operable by an operation device to receive the distributed lubricated fluid from a reservoir.

This application is the U.S. national phase of International ApplicationNo. PCT/SE2010/050830, filed 12 Jul. 2010, which designated the U.S. andclaims the benefit of U.S. Provisional Nos. 61/229,755, filed 30 Jul.2009; 61/229,738 filed 30 Jul. 2009, 61/229,739 filed 30 Jul. 2009;61/229,743 filed 30 Jul. 2009; 61/229,745 filed 30 Jul. 2009; 61/229,746filed 30 Jul. 2009; 61/229,747 filed 30 Jul. 2009; 61/229,748 filed 30Jul. 2009; 61/229,751 filed 30 Jul. 2009; 61/229,752 filed 30 Jul. 2009;61/229,761 filed 30 Jul. 2009; 61/229,767 filed 30 Jul. 2009; 61/229,778filed 30 Jul. 2009; 61/229,786 filed 30 Jul. 2009; 61/229,789 filed 30Jul. 2009; 61/229,796 filed 30 Jul. 2009; 61/229,735 filed 30 Jul. 2009;and which claims priority to Swedish Application Nos.: 0900981-2 filed10 Jul. 2009; 0900957-2 filed 10 Jul. 2009; 0900958-0 filed 10 Jul.2009; 0900959-8 filed 10 Jul. 2009; 0900960-6 filed 10 Jul. 2009;0900962-2 filed 10 Jul. 2009; 0900963-0 filed 10 Jul. 2009; 0900965-5filed 10 Jul. 2009; 0900966-3 filed 10 Jul. 2009; 0900968-9 filed 10Jul. 2009; 0900969-7 filed 10 Jul. 2009; 0900970-5 filed 10 Jul. 2009;0900972-1 filed 10 Jul. 2009; 0900973-9 filed 10 Jul. 2009; 0900974-7filed 10 Jul. 2009; 0900976-2 filed 10 Jul. 2009 and 0900978-8 filed 10Jul. 2009, the entire contents of each of which are hereby incorporatedby reference.

TECHNICAL FIELD

The present invention relates generally to medical implants.

BACKGROUND

The lubricating fluid (synovial fluid) reduces friction between thearticular cartilage and other tissues in a joint and lubricates andcushions the bone and tissue components of the joint during movement. Ifthe lubricating fluid is negatively affected and/or the joint articularcartilage usually covering the bone of the joint is damaged, in mostcases due to older age and/or continuing extensive or abnormal strain onhuman or mammal joints (e.g. knee joint, hip joint), this can result ina degenerative joint disease (also known as osteoarthritis)characterized by a painful inflammation of the joint. Upon pathologicalreduction and change of composition of the lubricating fluid within thejoint space, which consists of the articulating surfaces of the adjacentbones with the joint being stabilized and encompassed by the jointcapsule and the synovial membrane, the lubricating fluid can no longerperform its usual task, i.e. lubrication of joint areas and shockabsorption, together with the articular cartilage.

If the articular cartilage is severely damaged due to osteoarthritis orthe like and/or the synovial fluid is reduced or altered in itscomposition reducing its potential to lower friction within the joint,the articulating surfaces are subjected to high friction and increasedwear causing a painful inflammation of the joint. This can result inserious restraints of movement, especially in walking and standing,which further augment degenerative processes of the joint. Degenerativejoint disease is highly prevalent in the western world, with thisdisease being one of the leading causes for chronic disability in Europeand the US.

Patients with osteoarthritis require a regular long term treatment bywhich lubricating fluid is introduced into the affected joint, which, onthe one hand, re-stores the physiological functionality of the damagedjoint as far as possible and, on the other hand, involves as littleextra stress as possible—both physical and psychological—for thepatient.

A known standard therapy is periodical extracorporeal injection ofsynthetic lubricating fluid into the joint space by a syringe in orderto substitute the absent physiological lubricating fluid. In suchconventional treatment it is inconvenient for the patient to deliver thelubricating fluid at regular time intervals through the skin and thejoint capsule into the joint by way of a syringe. Also, this may causeinjuries to the skin and the joint capsule, which increases the risk ofsevere infections of the delicate joint tissues. Therefor, an injectionmay not be performed more often than every 6 months.

Artificial joints have been an important part restoring thefunctionality of the natural joints of patients suffering from jointosteoarthritis and fractured and damaged joints. Among the mostsuccessful material combinations is the ceramic and polymer combinationcalled the Charnley type joint. This prosthesis type however, has alimited life span of 15-20 years due to wear of the polymer component.The particles created from the polymer wear triggers a macrophagereaction which has been found affects the fixation of the prosthesis inthe femoral bone and in worst cases makes the prosthesis come loose.Loosening of prosthesis is the number one reason for having to redo hipjoint surgery. Since the polymer material of the prosthetic Acetabularcup is relatively soft, the material need to be of considerablethickness for being stiff enough, for enabling fixation of the cup andfor resisting the wear from the contact with the prosthetic caput femur.The use of harder materials in the Acetabular cup have the disadvantagesof creating sounds when walking which propagates out of the body,furthermore harder material do not create the desired elastic propertieswhich is needed for reduce strains placed on the fixations of theprosthetic parts against the natural bone tissue.

SUMMARY

Please note that any embodiment or part of embodiment as well as anymethod or part of method could be combined in any way. All examplesherein should be seen as part of the general description and thereforepossible to combine in any way in general terms.

Please note that the description in general should be seen as describingboth of an apparatus and a method.

The various aforementioned features of the embodiments may be combinedin any way if such combination is not clearly contradictory.

An implantable medical device for implantation in a mammal joint havingat least two contacting surfaces is provided. The implantable medicaldevice comprising an artificial concave acetabulum contacting surfaceadapted to replace the surface of the acetabulum contacting surface. Theartificial concave acetabulum contacting surface is adapted to belubricated, when implanted in said joint, At least one inlet is adaptedto receive a lubricating fluid from a reservoir, and at least onechannel at least partly integrated in said artificial concave acetabulumcontacting surface, wherein the channel is in fluid connection with saidat least one inlet for distributing said lubricating fluid to thesurface of said artificial concave contacting surface. The medicaldevice could be adapted to be operable by an operation device to receivethe distributed lubricating fluid from a reservoir. The possibility toinject a lubricating fluid intermittently or when needed reduces thefriction in the joint and enables an optimal level of lubrication in thejoint.

According to one embodiment of the implantable medical device, the atleast one channel could be adapted to distribute the lubricating fluidto the surface of the artificial contacting surface on two or moreportions of the artificial contacting surface for lubricating theartificial contacting surface. The distribution in more than one portioncould enable a more even distribution of the lubricating fluid.

According to another embodiment the medical device further comprises areservoir adapted to hold the lubricating fluid. The reservoir could bean implantable reservoir placed in a cavity of the body, subcutaneouslyor in connection with bone.

The implantable medical device could further comprise an operationdevice adapted to transport a lubricating fluid from a reservoir to theartificial contacting surface for lubricating the artificial contactingsurface.

According to one embodiment a reservoir could be adapted to hold thelubricating fluid and the operation device according to any of theembodiments herein could be adapted to transport the lubricating fluidfrom the reservoir to the artificial contacting surface for lubricatingthe artificial contacting surface. The operation device could be poweredand could comprise a pump adapted to pump fluid from the reservoir tothe artificial contacting surface for lubricating the artificialcontacting surface.

The operation device, according to any of the embodiments herein couldcomprise a reservoir, pre-loaded with pressurized lubricating fluid.

According to another embodiment, the implantable medical device couldfurther comprise an implantable injection port adapted to allow, byinjection into the injection port, to pre-load the reservoir withpressurized lubricating fluid.

The implantable medical device could, according to one embodiment,further comprise a valve adapted to close the connection between thereservoir and the artificial contacting surface. The reservoir could beadapted to be placed in a unit separate from the artificial contactingsurface and adapted to be connected to the artificial contacting surfacewith a conduit. The reservoir could comprise a moveable wall portionadapted to move and change the volume of the reservoir, the wall portioncould be a powered wall portion which could comprise a motor.

According to another embodiment, the implantable medical device couldcomprise at least one outlet and at least one further channel at leastpartly integrated in the artificial contacting surface. The medicaldevice could be adapted to allow circulation of a lubricating fluid; outfrom the artificial contacting surface through the outlet and in to theartificial contacting surface through the inlet. The circling of thefluid could be performed by means of an operation device adapted tocirculate the lubricating fluid. The circling system could comprise areservoir adapted to add fluid to the circulating lubricating fluid,and/or a filter to clean the circulating lubricating fluid.

The operation device according to any of the embodiments could beadapted to intermittently transport a lubricating fluid to theartificial contacting surface.

The implantable medical device could according to one embodimentcomprise a sensor adapted to sense a physical parameter inside thejoint, or a pressure or volume of the lubricating fluid, or a functionalparameter of the operation device to control the operation device toadjust the flow of lubricating fluid to the artificial contactingsurface.

The reservoir according to any of the embodiments could be connected tothe reservoir through a conduit. The inlet could comprise a connectionpart, for connecting the conduit to the medical device. The conduit,according to any of the embodiments could comprise a plurality ofportions, which could be adapted to be connected to each other throughan inter-connecting part. A first portion of the conduit could be inconnection with the medical device, and the second portion of theconduit could be in connection with the reservoir. The conduit couldaccording to one embodiment be adapted to pass through a bone of thebody for long-term keeping a passage way open through the bone, allowingthe lubricating fluid to reach the artificial contacting surface.According to another embodiment the conduit is adapted to pass through ajoint capsule of the body for long-term keeping a passage way openthrough the joint capsule, allowing the lubricating fluid to reach theartificial contacting surface and according to yet another embodimentthe conduit is adapted to pass through the pelvic bone from the oppositesaid of the acetabulum and into the hip joint.

The implantable medical device could be adapted to be implanted in a hipjoint of a patient, in which case the artificial contacting surface ofthe medical device could be adapted to at least partly replace acontacting surface of the Acetabulum, and/or the Caput femur.

The implantable medical device could according to one embodiment furthercomprise a second artificial contacting surface. According to oneembodiment the first artificial contacting surface comprises a convexshape towards a centre of the hip joint and the second artificialcontacting surface comprises a concave shape towards the centre of thehip joint. The first artificial contacting surface is according to thisopposite embodiment adapted to be fixated to the pelvic bone of thehuman patient, and the second artificial contacting surface is adaptedto be fixated to the femoral bone of the human patient.

The implantable medical device could be adapted to be introduced intothe hip joint through a hole in the pelvic bone, from the abdominal sideof the pelvic bone, an operational method which allows the hip jointcapsule to be kept intact.

The reservoir could according to one embodiment be adapted to be placedinside, or at least partly inside of a bone of the patient, the bonecould for example be the femoral bone, the pelvic bone or the collumfemur of the patient.

According to another embodiment, the reservoir could be adapted to beplaced subcutaneously or in a cavity in the body, which could be acavity in a region selected from a group of regions consisting of: theabdominal region, the inguinal region, the pelvic region, and the thighregion.

The implantable medical device could according to one embodimentcomprise an injection port for filling of the reservoir. The injectionport could comprise a self sealing membrane, which for example could bea Parylene coated silicone membrane. The injection port could be adaptedto be implanted subcutaneously, in connection with bone or in a cavityof the body.

The reservoir could be adapted to place the lubricating fluid underpressure. For achieving the pressure the reservoir could be adapted tobe spring loaded, comprise a chamber adapted to hold a compressed gas orcomprise an elastic wall adapted to create the pressure. According toone embodiment the reservoir comprises a Parylene coated siliconeelastic wall.

According to another embodiment, the implantable medical device isadapted to be implanted in a knee joint of a patient. The artificialcontacting surface could according to one embodiment be adapted to atleast partly replace a contacting surface of the femoral bone, whichcould be a contacting surface of the Tibia bone and/or the femoral bone.

According to one embodiment the artificial contacting surface is adaptedto replace at least one of the medial or lateral part of the contactingsurface of tibia of the knee joint and according to another embodimentthe implantable medical device is adapted to replace at least one of themedial or lateral part of the contacting surface of the femoral bone ofthe knee joint. In yet another embodiment the medical device is adaptedto replace both the contacting surface of the femoral bone of the kneejoint and the contacting surface of the tibia bone of the knee joint.

According to one embodiment the reservoir according to any of theembodiments is adapted to be refilled from outside of the human body,the refilling could be performed through an implantable injection port.

According to one embodiment, the reservoir is adapted to hold a pressurewhich is possible to increase through injection of a lubricating fluidthrough the injection port.

The implantable medical device according to any of the embodiments couldbe adapted to be a part of a system which further could comprise atleast one switch implantable in the patient for manually andnon-invasively controlling the implantable medical device. The energizedsystem enables an operation device to operate the lubrication performedby the medical device.

The system could according to one embodiment further comprise ahydraulic device having an implantable hydraulic reservoir, which couldbe hydraulically connected to the implantable medical device. Theimplantable medical device could be adapted to be non-invasivelyregulated by manually pressing the hydraulic reservoir.

According to another embodiment, the system could further comprise awireless remote control for non-invasively controlling the implantablemedical device. The wireless remote control could comprise at least oneexternal signal transmitter and/or receiver, further comprising aninternal signal receiver and/or transmitter implantable in the patientfor receiving signals transmitted by the external signal transmitter ortransmitting signals to the external signal receiver. The wirelessremote control could further be adapted to transmit at least onewireless control signal for controlling the implantable medical device.The wireless control signal could comprise a frequency, amplitude, orphase modulated signal or a combination thereof. The wireless remotecontrol could further be adapted to transmit an electromagnetic carrierwave signal for carrying the control signal.

According to another embodiment the system could comprise a wirelessenergy-transmission device for non-invasively energizing the implantableenergy consuming components of the implantable medical device withwireless energy. The wireless energy could comprise a wave signal,selected from the following: a sound wave signal, an ultrasound wavesignal, an electromagnetic wave signal, an infrared light signal, avisible light signal, an ultra violet light signal, a laser lightsignal, a micro wave signal, a radio wave signal, an x-ray radiationsignal, gamma radiation signal, an electric field, a magnetic field, acombined electric and magnetic field.

A control signal in the system could comprise an electric field, amagnetic field, a combined electric and magnetic field. The signal couldcomprise an analogue signal, a digital signal, or a combination of ananalogue and digital signal. For powering the energy consumingcomponents of the implantable medical device, the implantable systemcould comprise an implantable internal energy source. According toanother embodiment the system comprises an external energy source fortransferring energy in a wireless mode, wherein the internal energysource is chargeable by the energy transferred in the wireless mode.

According to a further embodiment the system could further comprise asensor or a measuring device sensing or measuring a functional parametercorrelated to the transfer of energy for charging the internal energysource, and a feedback device for sending feedback information frominside the patient's body to the outside thereof, the feedbackinformation could be related to the functional parameter sensed by thesensor or measured by the measuring device.

According to yet another embodiment, the system could further comprise afeedback device for sending feedback information from inside thepatient's body to the outside thereof, the feedback information beingrelated to at least one of a physical parameter of the patient and afunctional parameter related to the implantable medical device.

The system could according to one embodiment further comprise a sensorand/or a measuring device and an implantable internal control unit forcontrolling the implantable medical device in response to informationbeing related to at least one of a physical parameter of the patientsensed by the sensor or measured by the measuring device and afunctional parameter related to the implantable medical device sensed bythe sensor or measured by the measuring device. The physical parametercould according to one embodiment be a pressure or a motility movement.

The system could according to one embodiment comprise an external datacommunicator and an implantable internal data communicator communicatingwith the external data communicator, the internal communicator feedsdata related to the implantable medical device or the patient to theexternal data communicator and/or the external data communicator feedsdata to the internal data communicator.

The system according to any of the embodiments herein, could furthercomprise a motor or a pump for operating the implantable medical device,or a hydraulic operation device for operating the implantable medicaldevice. The operation device could comprise a servo designed to decreasethe force needed for the operation device to operate the implantablemedical device instead the operation device acting a longer way,increasing the time for a determined action.

According to one embodiment the system could further comprise anoperation device for operating the implantable medical device. Thewireless energy could be used in its wireless state to directly powerthe operation device to create kinetic energy for the operation of theimplantable medical device, as the wireless energy is being transmittedby the energy-transmission device. The system could also comprise anenergy-transforming device for transforming the wireless energytransmitted by the energy-transmission device from a first form into asecond form energy.

The energy-transforming device could be adapted to directly powerimplantable energy consuming components of the implantable medicaldevice with the second form energy, as the energy-transforming devicetransforms the first form energy transmitted by the energy-transmissiondevice into the second form energy. The second form energy couldcomprise at least one of a direct current, pulsating direct current andan alternating current. The energy of the first or second form couldcomprise at least one of magnetic energy, kinetic energy, sound energy,chemical energy, radiant energy, electromagnetic energy, photo energy,nuclear energy thermal energy, non-magnetic energy, non-kinetic energy,non-chemical energy, non-sonic energy, non-nuclear energy andnon-thermal energy.

For protecting the system or the parts of the system, the system couldfurther comprise an implantable electrical component including at leastone voltage level guard and/or at least one constant current guard. Acontrol device could be arranged to control the transmission of wirelessenergy from the energy-transmission device, and an implantable internalenergy receiver for receiving the transmitted wireless energy, theinternal energy receiver could be connected to implantable energyconsuming components of the implantable medical device for directly orindirectly supplying received energy thereto, the system could furthercomprise a determination device adapted to determine an energy balancebetween the energy received by the internal energy receiver and theenergy used for the implantable energy consuming components of theimplantable medical device, the control device could be adapted tocontrol the transmission of wireless energy from the externalenergy-transmission device, based on the energy balance determined bythe determination device.

The determination device could be adapted to detect a change in theenergy balance, the control device could be adapted to control thetransmission of wireless energy based on the detected energy balancechange. The determination device could in turn be adapted to detect adifference between energy received by the internal energy receiver andenergy used for the implantable energy consuming components of theimplantable medical device, and the control device could be adapted tocontrol the transmission of wireless energy based on the detected energydifference.

The energy-transmission device could comprise a coil placed externallyto the human body, which in turn could further comprise an implantableenergy receiver to be placed internally in the human body and anelectric circuit connected to power the external coil with electricalpulses to transmit the wireless energy, the electrical pulses havingleading and trailing edges, the electric circuit adapted to vary firsttime intervals between successive leading and trailing edges and/orsecond time intervals between successive trailing and leading edges ofthe electrical pulses to vary the power of the transmitted wirelessenergy, the energy receiver receiving the transmitted wireless energyhaving a varied power. The electric circuit could be adapted to deliverthe electrical pulses to remain unchanged except varying the firstand/or second time intervals.

The system could according to one embodiment have an electric circuithaving a time constant which is adapted to vary the first and secondtime intervals only in the range of the first time constant, so thatwhen the lengths of the first and/or second time intervals are varied,the transmitted power over the coil is varied.

The implantable internal energy receiver for receiving wireless energycould comprise an internal first coil and a first electronic circuitconnected to the first coil, and an external energy transmitter fortransmitting wireless energy, the energy transmitter having an externalsecond coil and a second electronic circuit connected to the secondcoil, wherein the external second coil of the energy transmittertransmits wireless energy which is received by the first coil of theenergy receiver, the system further comprising a power switch forswitching the connection of the internal first coil to the firstelectronic circuit on and off, such that feedback information related tothe charging of the first coil is received by the external energytransmitter in the form of an impedance variation in the load of theexternal second coil, when the power switch switches the connection ofthe internal first coil to the first electronic circuit on and off.

The system could also comprise an implantable internal energy receiverfor receiving wireless energy, the energy receiver having an internalfirst coil and a first electronic circuit connected to the first coil,and an external energy transmitter for transmitting wireless energy, theenergy transmitter having an external second coil and a secondelectronic circuit connected to the second coil, wherein the externalsecond coil of the energy transmitter transmits wireless energy which isreceived by the first coil of the energy receiver, the system furthercomprising a feedback device for communicating out the amount of energyreceived in the first coil as a feedback information, and wherein thesecond electronic circuit includes a determination device for receivingthe feedback information and for comparing the amount of transferredenergy by the second coil with the feedback information related to theamount of energy received in the first coil to obtain the couplingfactors between the first and second coils. The system according toclaim 98, wherein the energy transmitter regulates the transmittedenergy in response to the obtained coupling factor.

In the embodiments in which the system comprises an external secondcoil, the external second coil could be adapted to be moved in relationto the internal first coil to establish the optimal placement of thesecond coil, in which the coupling factor is maximized. The externalsecond coil could also be adapted to calibrate the amount of transferredenergy to achieve the feedback information in the determination device,before the coupling factor is maximized.

According to a second aspect, a method of implanting the medical deviceaccording to any of the embodiments herein is further provided. Themethod comprises the steps of: creating an opening reaching from outsideof the human body into a joint, providing the artificial contactingsurface to the joint, fixating the artificial contacting surface to thejoint, implanting the reservoir in the human body, and lubricating theartificial contacting surface with use of a lubricating fluid containedin the reservoir.

The step of lubricating the artificial contacting surface with use of alubricating fluid contained in the reservoir could comprise implantingan operation device adapted to transport the fluid from the reservoir tothe artificial contacting surface. According to another embodiment thestep of lubricating the artificial contacting surface with use of alubricating fluid contained in the reservoir comprises providing anenergy source for powering the operation device.

According to yet another embodiment the step of lubricating theartificial contacting surface with use of a lubricating fluid containedin the reservoir could comprise powering the operation device using theenergy source.

The step of implanting a reservoir in the human body could, according toone embodiment, comprise the step of implanting an operation devicebeing integrated in the reservoir, allowing the step of lubricating theartificial contacting surface with use of a lubricating fluid containedin the reservoir, using the operation device transporting the fluid fromthe reservoir to the artificial contacting surface.

Implanting the reservoir, according to any of the embodiments couldcomprise the step of implanting the reservoir at least partially insideof a bone of the patient, which could be the femoral bone of thepatient, the tibia bone of the patient and/or the pelvic bone of thepatient.

The step of providing the artificial contacting surface could comprisethe step of providing the artificial contacting surface from theabdominal side of the pelvic bone.

The step of implanting the reservoir in the human body could comprisethe step of implanting the reservoir subcutaneously. Placing thereservoir subcutaneously allows simple access to the reservoir andeliminates the need for a long conduit between an injection port and thereservoir.

The step of implanting the reservoir subcutaneously could comprise thestep of implanting the reservoir in at least one of the regions of thepatient selected from a group of regions consisting of: the abdominalregion, the inguinal region, the pelvic region, the thigh region, andthe calf region.

A further step of implanting an injection port for filling of thereservoir could be performed. The implantation of an injection portcould comprise the step of implanting the injection port in connectionwith bone.

According to one embodiment, the medical device comprises an artificialcontacting surface adapted to carry weight in a joint of a patient, theartificial contacting surface could comprise at least one channel fortransporting a lubricating fluid, the method comprises the steps of:implanting the medical device in a joint of the human patient,implanting a conduit adapted to be connected to the medical device,implanting an operation device for transporting a lubricating fluidinside the conduit, implanting a reservoir adapted to hold a lubricatingfluid, and at least postoperatively transporting, by the operationdevice, the lubricating fluid from the reservoir to the artificialcontacting surface in the conduit and further through the channel in theartificial contacting surface, thereby applying the lubricating fluid tothe artificial contacting surface.

Please note that any embodiment or part of embodiment as well as anymethod or part of method could be combined in any way. All examplesherein should be seen as part of the general description and thereforpossible to combine in any way in general terms.

BRIEF DESCRIPTION OF THE DRAWINGS

The embodiments are now described, by way of example, with reference tothe accompanying drawings, in which:

FIG. 1 shows a lateral view of a knee joint when a medical device hasbeen provided.

FIG. 2 shows the medical device according to one embodiment, in section.

FIG. 3 shows the medical device according to one embodiment comprisingan artificial contacting surface.

FIG. 4 shows the medical device according to one embodiment comprisingan artificial contacting surface, in section.

FIG. 5 shows a frontal view of a human patient displaying the hip joint.

FIG. 6 shows a lateral view of a human patient, in section, when alaparoscopic/arthroscopic procedure is being performed.

FIG. 7 shows the hip joint in section when a hole in the pelvic bone isbeing created.

FIG. 8a shows the hip joint in section when a small hole in the pelvicbone is being created.

FIG. 8b shows the hip joint in section when a medical device has beenprovided through a hole in the pelvic bone.

FIG. 9a shows the hip joint in section when a medical device is beingprovided through a hole in the pelvic bone.

FIG. 9b shows the hip joint in section when a medical device has beenprovided through a hole in the pelvic bone.

FIG. 10 shows the hip joint is section when a medical device connectedto an implantable lubrication system is being provided.

FIG. 11a-c shows a surgical instrument for use in a method of providinga medical device according to any of the embodiments herein.

FIG. 12 shows the hip joint in section when a medical device has beenimplanted and connected to an implantable reservoir.

FIG. 13a shows the lateral view of a hip joint ion section when a holeis being created through the femoral bone.

FIG. 13b shows a hip joint in section when a medical device is beingprovided through a hole in the femoral bone.

FIG. 13c shows a hip joint in section when a medical device has beenprovided through a hole in the femoral bone.

FIG. 13d shows a reservoir adapted to be connected to a medical device,in further detail.

FIG. 14 shows the injection of a lubricating fluid into an implantableinjection port.

FIG. 15 shows an implantable medical device in an opposite embodiment.

FIG. 16 shows a hip joint in section, when an implantable medical devicein an opposite embodiment has been placed.

FIG. 17 shows a hip joint in section, when an implantable medical devicein an opposite embodiment has been placed.

FIG. 18 shows a hip joint in section, when an implantable medical devicein an opposite embodiment has been placed and connected to a reservoir.

FIG. 19 shows a frontal view of a knee joint of a human patient.

FIG. 20 shows a frontal view of a knee joint of a human patient, when amedical device has been provided.

FIG. 21 shows an implantable lubricating system.

FIG. 22a shows a lateral view of a knee joint when a medical device hasbeen provided to the femoral bone.

FIG. 22b shows a lateral view of a knee joint when a medical device hasbeen provided to the tibia bone.

FIG. 23 shows a medical device comprising an artificial knee jointsurface.

FIG. 24 shows a medical device comprising an artificial knee jointsurface in section.

FIG. 25a shows a medical device comprising multiple medical deviceparts.

FIG. 25b shows a medical device comprising multiple medical deviceparts, when assembled.

FIG. 26 shows the placing of a medical device comprising multiplemedical device parts, when being fixated to the tibia bone.

FIG. 27 shows the implantable medical device according to an embodiment,when fixated to the tibia bone and connected to a reservoir and aninjection port.

FIG. 28 shows a frontal view of a human patient when an implantablelubricating system has been provided.

FIG. 29 shows an implantable lubrication system in further detail.

FIG. 30 shows an implantable circling lubrication system in furtherdetail.

FIG. 31 shows an implantable circling lubrication system comprising afilter, in further detail.

FIG. 32 shows an implantable lubrication system, when lubricating anartificial hip joint surface.

FIG. 33a shows an implantable lubrication system comprising aretractable needle, in a first state.

FIG. 33b shows an implantable lubrication system comprising aretractable needle, in a second state.

FIG. 34 illustrates a system for treating a disease, wherein the systemincludes an apparatus of the invention implanted in a patient.

FIGS. 35-49 schematically show various embodiments of the system forwirelessly powering the apparatus shown in FIG. 34.

FIG. 50 is a schematic block diagram illustrating an arrangement forsupplying an accurate amount of energy used for the operation of theapparatus shown in FIG. 34.

FIG. 51 schematically shows an embodiment of the system, in which theapparatus is operated with wire bound energy.

FIG. 52 is a more detailed block diagram of an arrangement forcontrolling the transmission of wireless energy used for the operationof the apparatus shown in FIG. 34.

FIG. 53 is a circuit for the arrangement shown in FIG. 52, according toa possible implementation example.

FIGS. 54-60 show various ways of arranging hydraulic or pneumaticpowering of an apparatus implanted in a patient.

DETAILED DESCRIPTION

In the following a detailed description of preferred embodiments of thepresent invention will be given. In the drawing figures, like referencenumerals designate identical or corresponding elements throughout theseveral figures. It will be appreciated that these figures are forillustration only and are not in any way restricting the scope of theinvention. Thus, any references to direction, such as “up” or “down”,are only referring to the directions shown in the figures. Also, anydimensions etc. shown in the figures are for illustration purposes.

Please note that any embodiment or part of embodiment as well as anymethod or part of method could be combined in any way. All examplesherein should be seen as part of the general description and thereforpossible to combine in any way in general terms.

Functional hip movements are to be understood as movements of the hipthat at least partly correspond to the natural movements of the hip. Onsome occasions the natural movements of the hip joint might be somewhatlimited or altered after hip joint surgery, which makes the functionalhip movements of a hip joint with artificial surfaces somewhat differentthan the functional hip movements of a natural hip joint.

The functional position of an implantable medical hip device orprosthesis is the position in which the hip joint can perform functionalhip movements. The final position is to be understood as a functionalposition in which the medical device needs no further position change.

Functional knee movements are to be understood as movements of the kneethat at least partly correspond to the natural movements of the knee. Onsome occasions the natural movements of the knee joint might be somewhatlimited or altered after knee joint surgery, which makes the functionalknee movements of a knee joint with artificial surfaces somewhatdifferent than the functional knee movements of a natural knee joint.

The functional position of an implantable medical knee device orprosthesis is the position in which the knee joint can performfunctional knee movements.

Functional knee joint is a knee joint that can perform functional kneemovements either with or without an implanted medical device orprosthesis.

Full functional size is to be understood as the size of the medical kneedevice when said medical device is implanted in the knee joint.

Arthroscopy is to be understood as key hole surgery performed in ajoint, since the arthroscopic procedure could be performed in theabdomen of the patient some of the steps of this arthroscopic procedureis more laparoscopic, however for the purpose of this invention the twoterms arthroscopy and laparoscopy is used synonymously and for thepurpose of this invention the main purpose of these methods are is thatthey are minimally invasive.

The medical device according to any of the embodiments could comprise atleast one material selected from a group consisting of:polytetrafluoroethylene (PTFE), perfluoroalkoxy (PFA) and fluorinatedethylene propylene (FEP). It is furthermore conceivable that thematerial comprises a metal alloy, such as cobalt-chromium-molybdenum ortitanium or stainless steel, or polyethylene, such as cross-linkedpolyethylene or gas sterilized polyethylene. The use of ceramic materialis also conceivable, in the artificial contacting surfaces or the entiremedical device such as zirconium or zirconium dioxide ceramics oralumina ceramics. The part of the medical device in contact with humanbone for fixation of the medical device to human bone could comprise apoorhouse structure which could be a porous micro or nano-structureadapted to promote the growth-in of human bone in the medical device forfixating the medical device. The porous structure could be achieved byapplying a hydroxy-apatite (HA) coating, or a rough open-pored titaniumcoating, which could be produced by air plasma spraying, a combinationcomprising a rough open-pored titanium coating and a HA top layer isalso conceivable. The contacting parts could be made of a selflubricated material such as a waxy polymer, such as PTFE, PFA, FEP, PEor UHMWPE, or a powder metallurgy material which could be infused with alubricant, which preferably is a biocompatible lubricant such as aHyaluronic acid derivate. It is also conceivable that the material ofcontacting parts or surfaces of the medical device herein is adapted tobe constantly or intermittently lubricated. According to someembodiments the parts or portions of the medical device could comprise acombination of metal materials and/or carbon fibers and/or boron, acombination of metal and plastic materials, a combination of metal andcarbon based material, a combination of carbon and plastic basedmaterial, a combination of flexible and stiff materials, a combinationof elastic and less elastic materials, Corian or acrylic polymers.

FIG. 1 shows a medical device according to an embodiment in which themedical device comprises a first artificial contacting surface 1101adapted to replace the distal surface of the femoral bone 102, beingpart of the knee joint. The first artificial contacting surface 1101could be adapted to replace the surface of the lateral condyle, themedial condyle or both the lateral and medial condyles. The medicaldevice of FIG. 1 further comprises a second artificial contactingsurface 1102 being adapted to replace the contacting surface of thetibia bone being the other contacting surface of the knee joint. Theimplantable medical device comprises an inlet 1123 adapted to receive alubricating fluid from a reservoir 1108, which according to thisembodiment is placed on the rear side of the tibia bone and the rearside of the femoral bone 102, respectively. The reservoir 1108 isaccording to this embodiment adapted to be refilled by means of aninjection port 1107 being placed in fluid contact with the reservoir1108. The reservoir 1108 supplies the inlet 1123 with a lubricatingfluid through a conduit 1106 which supplies a fluid connection betweenthe medical device and the reservoir 1108. The reservoir is according tothis embodiment adapted to be placed under pressure through saidinjection port 1108 comprising chamber for pressurized gas which isfurther compressed when the reservoir 1108 is being filled through theinjection port 1107. The inlet 1123 transports the lubricating fluid toa channel 1105 which is at least partly integrated in said artificialcontacting surfaces 1101,1102. According to the embodiment of FIG. 1 thechannel 1105 is fully integrated in the medical device. The channel 1105distributes the lubricating fluid over the artificial contactingsurfaces 1101, 1102 and thereby lubricates the artificial contactingsurfaces 1101, 1102 and improves the function thereof by reducing thefriction. The implantable medical device could just as well be adaptedto be implanted in the knee joint of another mammal, such as a horse.

FIG. 2 shows the implantable medical device according to an embodimentwhere the medical device is adapted to replace parts of the hip joint.The medical device comprises a plurality of channels 1105 adapted tolubricate the artificial contacting surface of the hip joint by alubricating fluid being injected to the channel through a conduit 1106placed centrally in the implantable medical device. The conduit 1106places the plurality of channels 1105 in fluid connection with areservoir 1108 which is located in the stem part, adapted for fixationin the femoral bone of a human patient, of said medical device. Theconduit 1106 transports lubricating fluid to the inlet 1123 for furtherdistribution to the channels 1105. The reservoir 1108 according to theembodiment of FIG. 2 is spring loaded by a spring 1109 which pushes amovable wall portion in the shape of a piston 1110 for placing saidlubricating fluid under pressure. The reservoir 1108 is adapted to berefilled through the injection port 1107, which is placed on the lateralside of the medical device. The injecting of lubricating fluid throughthe injection port 1107 compresses the spring 1109 which thereby placesthe lubricating fluid under pressure, which pressure presses thelubricating fluid through the conduit 1106 and to the channels 1105 forlubricating the hip joint of a human patient. The spring loadedreservoir 1108 could be replaced by other types of reservoirs adapted toplace a pressure on the lubricating fluid, such as a reservoir 1108comprising a chamber filled with a pressurized gas which is furtherpressurized by the injecting of a lubricating fluid through an injectionport, it is furthermore conceivable that the reservoir 1108 is anelastic reservoir in which case the elastic properties of the elasticreservoir pressurized the lubricating fluid.

FIG. 3 shows the medical device according to an embodiment in which themedical device is adapted to replace the contacting surface of the caputfemur of the femoral bone of a human patient. The medical deviceaccording to this embodiment the artificial contacting surface 1103 b ofthe medical device comprises a plurality of channels adapted tolubricate the hip joint of a human patient with a lubricating fluid. Themedical device further comprises a fixating portion 44 for fixating themedical device to the caput femur and/or the collum femur of the femoralbone.

FIG. 4 shows the medical device according to FIG. 3 in section, showingthe medical device comprising a plurality of channels in fluidconnection with a reservoir (not shown) through a conduit 1106 placedcentrally in the fixating portion 44, the channels 1105 being fullyintegrated in the medical device. The conduit 1106 transportslubricating fluid to the inlet 1123 for further distribution to thechannels 1105. The conduit ends up in a connecting section 1111 which isadapted to connect the conduit to a second conduit or a reservoir, oradditional channels.

FIG. 5 shows a frontal view of the body of a human patient, illustratinga laparoscopic/arthroscopic method of operating the hip joint to providea medical device according to any of the embodiments herein from theopposite side from acetabulum 8. The hip joint comprises the acetabulum8 and the caput femur 5. The small incisions 14 in the abdominal wall ofthe human patient allows the insertion of laparoscopic/arthroscopictrocars 33 a,b,c into the body of the patients. Whereafter one or morecamera 34, a surgical instrument adapted to create a hole in the pelvicbone 35, or instruments 36 for introducing, placing, connecting,attaching, creating or filling an implantable medical device, can beinserted into the body through said laparoscopic/arthroscopic trocars 33a,b,c.

FIG. 6 shows a lateral view of the body of a human patient, with the hipjoint shown in section. The hip joint comprises a caput femur 5 placedat the very top of collum femur 6 which is the top part of the femurbone 7. The caput femur 5 is in connection with the acetabulum 8 whichis a bowl shaped part of the pelvic bone 9. Laparoscopic/arthroscopictrocars 33 a,b,c is being used to reach the hip joint 39 with one ormore camera 34, a surgical instrument 35 adapted to create a hole in thepelvic bone 9, or instruments 36 for introducing, placing, connecting,attaching, creating or filling an implantable medical device.

FIG. 7 shows the creation of a hole 18 in the pelvic bone 9, after thepelvic bone 9 has been dissected. The hole 18 is created from theabdominal side of the pelvic bone 9 through repetitive or continuousmovement of a hole creating device 22 placed into the human patient fromthe abdominal side of the pelvic bone 9. The hole 18 passes through thepelvic bone 9 from the opposite side from acetabulum 8 and into the hipjoint 19. According to a first embodiment the hole 18 is large whichallows an implantable medical device to pass through the hole 18 in itsfull functional size.

FIG. 8a shows a second embodiment in which the hole 20 created in asurgical or laparoscopic/arthroscopic method is much smaller as shown inFIG. 8a allowing the hole creating device 22 creating the hole 20 to besmaller, and thus also the incision and dissection performed in thehuman body.

FIG. 8b shows the hip joint in section when a medical device has beenprovided between the caput femur 5 and the acetabulum. The medicaldevice according to this embodiment comprises multiple channels 1105connected to a conduit 1106 which in turn is connected to a connectingportion placed in the hole in the pelvic bone 9. The conduit 1106transports lubricating fluid to the inlet 1123 for further distributionto the channels 1105. For insertion through a hole 18 in the pelvic bone9 being smaller than the medical device the medical device could berolled or compressed, or according to another embodiment, molded inplace either in a mould adapted to be resorbed by the human body, meltor serve as the surface of the medical device. The medical device couldbe adapted to be fixated using adhesive or a mechanical fixatingelement.

FIG. 9a shows a hip joint in section when a medical device is beingprovided, through a hole 18 in the pelvic bone 9 for replacing thecontacting surface of the caput femur 5. The medical device comprises anartificial contacting surface 1103 b and a fixating portion 44 placedcentrally in the medical device and adapted to fixate the medical deviceto the caput femur 5. The medical device comprises a plurality ofchannels 1105 which exits at the artificial contacting surface forlubricating the hip joint. The channels are in fluid connection with aconduit 1106 which in turn is connected to an interconnecting part 1111b adapted to connect the conduit to a second conduit 1106 b or a secondportion of the conduit 1106 b, which in turn is in fluid connection witha reservoir 1108 placed in the femoral bone 7 of the human patient. Thereservoir 1108 is placed in the femoral bone 7 and is adapted to hold apressurized lubricating fluid, which according to the embodiment shownin FIG. 9a is pressurized by means of said reservoir 1108 being springloaded by means of a spring 1109 in connection with a movable wallportion in the form of a piston 1110 pressurizing the lubricating fluid.The reservoir 1108 is furthermore connected to an injection port 1107which is positioned in connection with the femoral bone 7 below thegreater trochanter 1186, however, any other suitable placement is alsoconceivable, in connection with bone, in a cavity or subcutaneously. Themedical device is according to the embodiment of FIG. 9a operable usinga pressurized reservoir, however according to other embodiments themedical device is operable by a powered operating device, such as animplantable pump, which could be powered by direct propulsion, such asinductive or magnetic propulsion, or by an accumulated energy source,such as a battery. The channels or conduits could according to oneembodiment (not shown) comprise a valve for closing the flow oflubricating fluid through the conduit 1106 or channel 1105, therebyclosing the connection between the reservoir and the artificialcontacting surface. The valve could be powered and adapted to becontrolled form outside of the human body by means of for example aremote control.

FIG. 9b shows the hip joint in section when a medical device accordingto another embodiment has been provided to the hip joint, replacing thecontacting surface of the caput femur. The medical device comprises anartificial contacting surface 1103 b comprising a plurality of channels1105 which are connected to a conduit 1106, 1106 b placed in fixatingpart of the medical device. The conduit is in turn in fluid connectionwith a reservoir 1108 placed inside of the femoral bone, preferably inthe cancellous parts of the femoral bone, the reservoir is thereby influid connection with the channels of the medical device for lubricatingthe artificial contacting surface 1103 b of the medical device.

FIG. 10 shows the hip joint in section when an implantable medicaldevice adapted to replace the acetabulum contacting surface is beingprovided. The medical device comprises an artificial acetabulum surface65 comprising a plurality of channels connected to a conduit 1106 by aninter-connecting part 1111. The medical device is according to theembodiment shown in FIG. 10 adapted to be placed in a hole 18 in thepelvic bone 9 for replacing the acetabulum contacting surface 65. FIG.10 furthermore shows a unit to which the conduit 1106 is connected,according to one embodiment the unit comprises a reservoir 1108 and twopressure creating devices 1113 a, 1113 b adapted to create a pressurefor pressurizing the lubricating fluid for pressing said lubricatingfluid through the conduit 1106 and further through the plurality ofchannels 1105 for lubricating the implantable medical device. Theconduit 1106 transports lubricating fluid to the inlet 1123 for furtherdistribution to the channels 1105. The pressure creating devices couldbe spring loaded or comprise of a pressurized gas filled element whichis further pressurized by the injecting of a lubricating fluid into thereservoir 1108. The unit further comprises an injection port 1107 whichcomprises a self sealing membrane 1112, which preferably is a Parylenecoated silicone membrane. According to another embodiment the unitcomprises a powered operation device such as a pump housed in thecontainer 1113 a which pumps the lubricating fluid from the reservoir1108 through the conduit 1106 to the plurality of channels 1105.According to one embodiment the pump is powered by a battery housed inthe compartment 1113 b.

FIG. 11a shows a surgical instrument adapted to insert a medical deviceaccording to any of the embodiments herein, or a mould for creating amedical device, according to a first embodiment. The surgical instrumentcomprises a gripping portion 76 and a handling portion 77. According tothe embodiments shown in FIG. 11 a,b,c the instrument further comprisesa rotation element 78 that enables the gripping part 76 to rotate inrelation to the handling part 77, however it is equally conceivable thatthe surgical instrument lacks this rotation element 78.

FIG. 11b shows the surgical instrument adapted to insert a prosthesis,prosthetic parts or parts needed to create or provide a hip jointsurface, according to a second embodiment. According to this embodimentthe surgical instrument further comprises a parallel displaced section79, which increases the reach of the instrument and facilitates thereaching of the hip joint through a hole in the pelvic bone from theopposite side from acetabulum.

FIG. 11c shows the surgical instrument adapted to insert a prosthesis,prosthetic parts or parts needed to create or provide a hip jointsurface, according to a third embodiment. According to this embodimentthe surgical instrument further comprises two angle adjusting members 80a,b. The angle adjusting members could be adjustable for varying theangle of said gripping part 76 in relation to the handling portion 77,or fixed in an angle suitable for creating operating in a hip jointthrough a hole in the pelvic bone from the opposite side from acetabulum8.

FIG. 12 shows the hip joint in section when a medical device has beenprovided. The implantable medical device is adapted to replace theacetabulum surface and is inserted through a hole 18 in the pelvic bone9, however, in other embodiments it is equally conceivable that themedical device is adapted to be inserted through a hole in the femoral 7bone or the hip joint capsule. The medical device comprises a pluralityof channels 1105 interconnected through a conduit 1106 which places thechannels 1105 in fluid connection with each other. The conduit 1106transports lubricating fluid to the inlet 1123 for further distributionto the channels 1105. The conduit 1106 is further connected to a firstportion of an interconnecting part 1111 which is adapted to be connectedto a second portion of an interconnecting part 1111 b. Theinterconnecting part 1111 connects a first portion of the conduit 1106to a second portion of the conduit 1106, enabling a first portion of theconduit 1106 to be inserted from the acetabulum side of the pelvic bone9 and a second portion of the conduit 1106 to be inserted from thepelvic side, or opposite acetabulum side of the pelvic bone 9. Theconnection of two portions of the conduit 1106 is particularlybeneficial when the medical device has been inserted through a hole 18in the femoral bone 7 or the hip joint capsule and the reservoir 1108 isimplanted in the abdominal region of the human patient, or in anotherarea on the abdominal side of the pelvic bone 9. The conduit 1106 isthen further connected to the reservoir 1108 and adapted to transport alubricating fluid from the reservoir 1108 to an area of the hip joint.The reservoir 1108 is according to the embodiment shown in FIG. 12adapted to place the lubricating fluid under pressure by means of aspring 1109 exerting a force on a movable wall portion in the form of apiston 1110 pressing the lubricating fluid through the conduit 1106 andfurther through the channels 1105. The reservoir 1108 further comprisesan injection port 1107 placed in the top part of the reservoir 1108 forrefilling the reservoir 1108 and in the same event increasing thepressure of the lubricating fluid.

FIG. 13a shows a human patient in a lateral view showing the hip jointin section. The femoral bone 7 has a proximal part comprising the collumfemur 6 and most proximal the caput femur 5. In FIG. 13a a hole 82 isbeing created from an incision made in the thigh, the hole travels intothe femoral bone 7, following the collum femur 6 and exiting through thecaput femur 5 and thus into the hip joint. The hole is used to providethe hip joint with a medical device which preferably is possible to rollor bend for insertion through said hole 82.

FIG. 13b shows the hip joint in section when the medical device has beenprovided through the hole 82 in the femoral bone 7 and fixated in theacetabulum bowl 8. The medical device comprises a plurality of channels1105 connected to each other by a conduit 1106. According to otherembodiments, the medical device could be provided through the hip jointcapsule, or a hole in the pelvic bone 9. After the medical device hasbeen provided, a tool 1180 housing a reservoir 1108 connected to aconduit 1106′ is used to provide the reservoir 1108 to the hole 82 inthe femoral bone 7 and to connect the reservoir to the conduit 1106 ofthe medical device.

FIG. 13c shows the hip joint in section when the reservoir 1108, placedin the hole 82 in the femoral bone 7 has been connected to the medicaldevice. Furthermore a conduit 1106′ reaching from the reservoir 1108 toan injection port 1107 for refilling and/or pressurizing the reservoir1108.

FIG. 13d shows the reservoir unit in further detail, the reservoir unitcomprises an inter-connecting portion 1111 placed at the end part of thereservoir unit, a pressurized reservoir 1108, which according to theembodiment of FIG. 13d is pressurized by means of a spring 1109 pushinga movable wall portion 1110 in the form of a piston 1110. The reservoirunit further comprises a conduit 1106′ in connection with the reservoir,and in connection with an injection port 1107, for filling the and/orpressurizing the reservoir 1108 comprising the lubricating fluid. Theinjection port 1107 comprises a self sealing membrane, which could be aself sealing Parylene coated silicone membrane, to inhibit cellmigration on the surface of the injection port. The section A-A showsthe centrally placed conduit 1106 in the center of the reservoir 1108for filling and/or pressurizing the reservoir 1108.

FIG. 14 shows a lateral view of a human patient in section, when alubricating fluid is being injected into an injection port 1107, bymeans of an injecting member 92 comprising a container 1115 adapted tocontain the lubricating fluid to be injected. The injection port isconnected to an implantable medical device placed in the hip jointthrough a conduit 1106 adapted to supply the fluid connection betweenthe injection port and the medical device. The medical device in turncomprises a plurality of channels 1105 for lubricating the artificialcontacting surfaces and thereby lubricating the hip joint. According tothe embodiment shown in FIG. 14 the medical device has been suppliedfrom the abdominal side of the pelvic bone 9 through a hole made in thepelvic bone which afterwards has been refilled with the removed boneplug and sealed and fixated with a mechanical fixating part attachedwith screws. According to other embodiments the medical device isprovided from the hip joint side of the pelvic bone 9 through the hipjoint capsule 12 or the femoral bone 7 and thereafter connected to theconduit 1106 on the abdominal side of the pelvic bone 9 through aninterconnecting part 1111. This enables the placing of the injectionport 1107 in the abdominal region, subcutaneously, in a cavity and/orsupported by the muscular or fascia tissue.

FIG. 15 shows the medical device in an opposite embodiment where themedical device comprises a first artificial contacting surface 112comprising a convex shape towards a centre of the hip joint. The firstartificial contacting surface 112 is adapted to be fixated to the pelvicbone 9 of the human patient. The artificial convex hip joint surface 112is adapted to be fixated to the pelvic bone 9, and is adapted to beinserted through a hole 18 in the pelvic bone 9. The medical devicecomprises a nut 120, comprising threads for securely fixating themedical device to the pelvic bone 9. The medical device furthercomprises a prosthetic part 118 adapted to occupy the hole 18 created inthe pelvic bone 9 after the medical device has been implanted in thepatient. The prosthetic part 118 comprises supporting members 119adapted to be in contact with the pelvic bone 9 and assist in thecarrying of the load placed on the medical device from the weight of thehuman patient in normal use. Normal use is defined as the same as aperson would use a natural hip joint. Further the medical devicecomprises a locking element 116 comprising a surface 117 adapted to bein contact with the artificial convex hip joint surface 112. The lockingelement 116 further comprises fixating members 115 which are adapted toassist in the fixation of the locking member 116 to the caput femur 5 orcollum femur 6, which in turns fixates the artificial convex hip jointsurface 112. The artificial convex hip joint surface 112 is fixated to aattachment rod 113 comprising a thread 114 that corresponds to thethread of the nut 120 in connection with the prosthetic part 118. Themedical device comprises a plurality of channels 1105 adapted tolubricate the artificial contacting surface 112. The plurality ofchannels 1105 are connected to each other through a conduit 1106 adaptedto transport a lubricating fluid from a reservoir 1108 to the pluralityof channels 1105 which are fully integrated in the artificial contactingsurface 112 of the medical device for lubricating the artificialcontacting surface 112 and thereby lubricating the hip joint.

FIG. 16 shows the medical device according to FIG. 15 when said medicaldevice is placed inside of the hip joint. The first artificialcontacting surface 112 comprising a convex shape towards a centre of thehip joint is positioned in a second artificial contacting surface 109comprising a concave shape towards the centre of the hip joint. Thesecond artificial contacting surface 109 is placed and fixated in thecaput 5 and collum femur 6 of the femoral bone an secured by a lockingelement 116 comprising a surface 117 facing the first artificial convexcontacting surface 112. The medical device comprises a plurality ofchannels 1105 which are connected to a conduit 1106 placed centrally inthe medical device for providing a lubricating fluid to the medicaldevice and lubricate the artificial contacting surface 112 and therebythe hip joint.

FIG. 17 shows the providing of a prosthetic part 118 to the hole 18 inthe pelvic bone 9. The prosthetic part 118 comprises supporting members119 adapted to be in contact with the pelvic bone 9 and assist in thecarrying of the load placed on the medical device from the weight of thehuman patient in normal use.

FIG. 18 shows an alternative embodiment of the medical device in theopposite embodiment in which the part of the medical device comprisingan artificial concave hip joint surface placed in the caput 5 and collumfemur 6 comprises a plurality of lubricating channels 1105 which areconnected to a conduit 1106 b establishing a fluid connection betweenthe medical device and the reservoir located in the cancellous bone ofthe collum femur 6. The reservoir is adapted to be refilled through aninjection port 1107 which according to the embodiment of FIG. 18 isplaced in connection with the femoral bone 7 and situated below thegreater trochanter 1186. The reservoir unit, and the function thereof,is described in further detail with reference to FIGS. 9a and 9b . FIG.18 furthermore shows the prosthetic part 118, when fixated to the pelvicbone 9 using screws 121. The screws could be assisted or replaced by anadhesive which could be applied in connection to the screws or at thesurface S between the prosthetic part and the pelvic bone 9.

FIG. 19 shows the right leg of a human patient. The femoral bone 102having a distal part comprising the lateral condyle 105, the medialcondyle 106 and an area between said lateral and said medial condyle131. The sections of the distal part of the femoral bone 102 comprisecontacting surfaces of the knee joint. The knee joint furthermorecomprises the patella 101, which is a triangular bone which articulateswith the femur 102 and covers and protects the knee joint. The kneejoint also comprises the minisci 107, 108 which are cartilaginouselements within the knee joint which serve as articulating surfaces toprotect the ends of the bones from rubbing on each other. The minisci107, 108 also acts as shock absorbers in the knee joint, to absorb theshocks from the movement of the human patient. There are two menisci107,108 in each knee, the medial meniscus 107 and the lateral meniscus108. In patients with osteoarthritis the menisci 107, 108 which acts asarticulating surfaces i.e. weight carrying surfaces are worn away and,in extreme cases, bone can be exposed in the joint. The knee joint isprotected by the knee joint capsule also known as the articular capsuleof the knee joint or the capsular ligament of the knee joint. The kneejoint capsule is wide and lax; thin in front and at the side; andcontains the patella 101, ligaments, menisci 107,108, and bursae, whichare small fluid-filled sacs made of white fibrous tissue. The knee jointcapsule consists of a synovial and a fibrous membrane separated by fattydeposits anteriorly and posteriorly.

FIG. 20 shows the knee joint when artificial knee joint surfaces 130,116 a has been provided to the distal part of the femoral bone 102 andthe proximal part of the tibia bone 104. A lateral and medial channel125 a,b supplies the contacting surfaces and thereby the knee joint withlubricating fluid for reducing the friction of the knee joint.

FIG. 21 shows the body of a human patient in a frontal view where areservoir unit 127 is implanted subcutaneously in the abdominal regionof the human patient. The reservoir unit according to this embodimentcomprises an operating device in the form of a pump 130 which is poweredby a battery 128 for pumping a fluid from the reservoir 129 through aconduit to a channel 125 supplying the artificial contacting surfaces ofthe knee joint with a lubricating fluid. The reservoir unit is fixatedto the muscular or fascia tissue 1181 of the abdominal wall through themuscular or fascia 1181 tissue being clamped between the reservoir unitand the injection port 1107 arranged at the outside of the muscular orfascia tissue 1181.

FIG. 22a shows an embodiment where the medical device comprises anartificial knee joint 115 surface clamps the medial, lateral or both themedial and lateral condyle 106 of the knee joint, being the distalportion of the femoral bone 7. The medical device, according to thisembodiment comprises a plurality of channels 1105 for lubricating theartificial contacting surfaces, the plurality of channels are in fluidconnection with each other through a conduit 1106 which in turn is influid connection with a reservoir 1108 comprising an injection port 1107for refilling the reservoir or pressurizing the lubricating fluidcontained in said reservoir 1108. The conduit 1106 transportslubricating fluid to the inlet 1123 for further distribution to thechannels 1105.

FIG. 22b shows the knee joint in a lateral view when a medical devicecomprising an artificial contacting surface 1102 has been provided tothe proximal part of the tibia bone 104, which together with the fibulabone 103 makes up the lower part of the leg. The artificial knee jointsurface comprises a plurality of channels 1105 which are in fluidconnection with a conduit 1106 adapted to transport lubricating fluidfrom a reservoir 1108. The reservoir 1108 is according to the embodimentof FIG. 22b placed at the rear side of the tibia bone 104 and fixated tothe tibia bone 104 and comprises an injection port 1107 for injecting alubricating fluid into the reservoir 1108 and/or pressurizing alubricating fluid contained in the reservoir 1108. The conduit 1106transports lubricating fluid to the inlet 1123 for further distributionto the channels 1105.

FIG. 23 shows the medical device for implantation in a knee joint infurther detail. The medical device comprises a plurality of channels1105 placed along the artificial contacting surface of the medicaldevice, for lubricating the contacting surface of the medical device.The channels 1105 are connected to a conduit 1106 for transport of thelubricating fluid along the artificial contacting surface 1101 of themedical device. The conduit 1106 transports lubricating fluid to theinlets 1123 for further distribution to the channels 1105.

FIG. 24 shows a sectional side-view of the medical device displaying thechannels 1105 being fully integrated in the artificial contactingsurface and connected to each other, the conduit 1106 supplies the 1105channels with lubricating fluid for lubricating the artificialcontacting surface of the medical device. The conduit 1106 transportslubricating fluid to the inlet 1123 for further distribution to thechannels 1105.

FIG. 25a shows a medical device for implantation in a knee joint of ahuman patient, the medical device comprises a several medical deviceparts 119 adapted to be connected to each other and to a medical devicebase part 118 by means of mechanical fixation elements 120 supplying aform fitting between the plurality of medical device parts 119 and thebase part 118. The medical device base part 118 furthermore comprises afixation portion 117 which is adapted to supply mechanical fixation ofthe medical device to a human bone, such as the proximal part of thetibia bone. The medical device base part 118 furthermore comprises achannel for supplying a lubricating fluid to the artificial contactingsurface of the knee joint.

FIG. 25b shows the medical device according to FIG. 25a , whenassembled.

FIG. 26 shows the medical device according to FIGS. 25a and 25b when themedical device is being fixated to the tibia bone 104.

FIG. 27 shows the proximal part of the tibia bone when a medical devicecomprising an artificial contacting surface 116 has been fixated to thetibia bone 104. The channel 1105 of the artificial contacting surface isconnected to a conduit 1106 which supplies a fluid connection betweenthe channel 1105 of the medical device and a first and second reservoir1108 placed inside of the tibia bone 104 on the medial and lateral side.The conduit further connects the first and second reservoir to aninjection port 1107 placed on the medial side of the pelvic bone forrefilling and/or pressurizing the reservoirs 1108. The reservoirs 1108,according to the embodiment shown in FIG. 27 are adapted to place thelubricating fluid under pressure, thereby pressing the lubricating fluidout of the channels 1105 onto the artificial contacting surface, forlubricating the knee joint. For this purpose, the reservoir 1108comprises a spring 1109 which is in connection with a movable wallportion in the form of a piston 1110, for pressing the lubricatingfluid.

FIG. 28 shows the human patient in a frontal view when an implantablelubrication system 120 has been implanted. The implantable lubricationsystem 120 is adapted to inject a lubricating fluid continuously,intermittently or when needed into said hip joint. According to theembodiment shown in FIG. 61 the implantable lubricating system comprisestwo interconnected units 121, 122. The two interconnected units areplaced in the abdominal region of the human patient and is in connectionwith the hip joint through a conduit 1106.

FIG. 29 shows the implantable lubricating system 120, which could beused in combination with any of the medical devices described herein, infurther detail. According to the embodiment shown, the implantablelubricating system comprises a first unit 121 comprising a pumpingmember 123 adapted to pump the lubricating fluid from a reservoir 1108to an area of the hip joint. The first unit 121 furthermore comprises aninjection port 1107 for filling the reservoir 1108 from outside of thehuman body without having to perform a surgical procedure. The injectionport 1107 comprises a self-sealing membrane which is penetratable with aneedle attached to a syringe. The first unit 121 further comprises areceiver of wireless energy 124 preferably comprising a coil. Saidreceiver of wireless energy is used to charge a battery 126. Accordingto this embodiment the implantable lubrication system 120 furthercomprises a second unit 122 which in turn comprises a battery 126 and afluid reservoir 1108. The lubricating fluid 128 is pumped from thereservoir 1108, through the first unit 121 with the pumping device,through the conduit 1106 and into the area of the hip joint where ithelps lubricating the hip joint surfaces or the artificial contactingsurfaces of the implantable medical device. The lubricating fluid ispreferably a biocompatible lubricating fluid such as hyaluronic acid.

FIG. 30 shows the implantable lubricating system adapted to be used withany of the medical device herein, according to an embodiment wherein theimplantable lubricating system is a circulating lubricating systemcomprising one inlet 130 into the joint to be lubricated and one outlet131. Preferably this system is a system for continuous lubrication wherethe pumping member 123 continuously circulates the lubricating fluid 128inside of the hip joint.

FIG. 31 shows an implantable lubricating system for circulatinglubrication adapted to be used with any of the medical device herein,wherein the lubricating system further comprises a filtering member 132for filtering the lubricating fluid. The filter is adapted to be selfcleaning and the out filtered matter is disposed through the disposalchannel 133, either into the abdomen of the human patient, or into acontainer attached to the disposal channel 133. Through the filtering ofthe lubricating fluid 128 the circulating lubricating system can operatefor long periods without the need of any surgical procedures.

FIG. 32 shows the lubricating fluid of FIG. 29, when lubricating animplantable medical device comprising an artificial contacting surface45 by providing a lubricating fluid 128.

FIG. 33a shows a lubricating system, which could be adapted to be usedin combination with any of the medical devices herein, according toanother embodiment wherein the lubricating system comprises a unit 1310comprising a retractable needle 1311 fixated to an operating system foroperating said retractable needle 1311. The needle is adapted topenetrate a self sealing membrane 1314 placed in the pelvic bone 9 forinjecting a lubricating fluid into the hip joint. A conduit 1106 isadapted to supply the unit 1310 with a lubricating fluid from aninjection port and/or from an additional reservoir which could beimplanted subcutaneously or in a cavity of the body.

FIG. 33b shows the lubricating system in a state in which theretractable needle 1311 is in its advanced position by the operatingdevice having operated the retractable needle 1311. The needle therebypenetrates the self sealing membrane 1314 and is placed in a position inwhich injection of a lubricating fluid is possible.

FIG. 34 illustrates a system for treating a disease comprising anapparatus 10 of the present invention placed in the abdomen of apatient. An implanted energy-transforming device 1002 is adapted tosupply energy consuming components of the apparatus with energy via apower supply line 1003. An external energy-transmission device 1004 fornon-invasively energizing the apparatus 10 transmits energy by at leastone wireless energy signal. The implanted energy-transforming device1002 transforms energy from the wireless energy signal into electricenergy which is supplied via the power supply line 1003.

The implanted energy-transforming device 1002 may also comprise othercomponents, such as: a coil for reception and/or transmission of signalsand energy, an antenna for reception and/or transmission of signals, amicrocontroller, a charge control unit, optionally comprising an energystorage, such as a capacitor, one or more sensors, such as temperaturesensor, pressure sensor, position sensor, motion sensor etc., atransceiver, a motor, optionally including a motor controller, a pump,and other parts for controlling the operation of a medical implant.

The wireless energy signal may include a wave signal selected from thefollowing: a sound wave signal, an ultrasound wave signal, anelectromagnetic wave signal, an infrared light signal, a visible lightsignal, an ultra violet light signal, a laser light signal, a micro wavesignal, a radio wave signal, an x-ray radiation signal and a gammaradiation signal.

Alternatively, the wireless energy signal may include an electric ormagnetic field, or a combined electric and magnetic field.

The wireless energy-transmission device 1004 may transmit a carriersignal for carrying the wireless energy signal. Such a carrier signalmay include digital, analogue or a combination of digital and analoguesignals. In this case, the wireless energy signal includes an analogueor a digital signal, or a combination of an analogue and digital signal.

Generally speaking, the energy-transforming device 1002 is provided fortransforming wireless energy of a first form transmitted by theenergy-transmission device 1004 into energy of a second form, whichtypically is different from the energy of the first form. The implantedapparatus 10 is operable in response to the energy of the second form.The energy-transforming device 1002 may directly power the apparatuswith the second form energy, as the energy-transforming device 1002transforms the first form energy transmitted by the energy-transmissiondevice 1004 into the second form energy. The system may further includean implantable accumulator, wherein the second form energy is used atleast partly to charge the accumulator.

Alternatively, the wireless energy transmitted by theenergy-transmission device 1004 may be used to directly power theapparatus, as the wireless energy is being transmitted by theenergy-transmission device 1004. Where the system comprises an operationdevice for operating the apparatus, as will be described below, thewireless energy transmitted by the energy-transmission device 1004 maybe used to directly power the operation device to create kinetic energyfor the operation of the apparatus.

The wireless energy of the first form may comprise sound waves and theenergy-transforming device 1002 may include a piezo-electric element fortransforming the sound waves into electric energy. The energy of thesecond form may comprise electric energy in the form of a direct currentor pulsating direct current, or a combination of a direct current andpulsating direct current, or an alternating current or a combination ofa direct and alternating current. Normally, the apparatus compriseselectric components that are energized with electrical energy. Otherimplantable electric components of the system may be at least onevoltage level guard or at least one constant current guard connectedwith the electric components of the apparatus.

Optionally, one of the energy of the first form and the energy of thesecond form may comprise magnetic energy, kinetic energy, sound energy,chemical energy, radiant energy, electromagnetic energy, photo energy,nuclear energy or thermal energy. Preferably, one of the energy of thefirst form and the energy of the second form is non-magnetic,non-kinetic, non-chemical, non-sonic, non-nuclear or non-thermal.

The energy-transmission device may be controlled from outside thepatient's body to release electromagnetic wireless energy, and thereleased electromagnetic wireless energy is used for operating theapparatus. Alternatively, the energy-transmission device is controlledfrom outside the patient's body to release non-magnetic wireless energy,and the released non-magnetic wireless energy is used for operating theapparatus.

The external energy-transmission device 1004 also includes a wirelessremote control having an external signal transmitter for transmitting awireless control signal for non-invasively controlling the apparatus.The control signal is received by an implanted signal receiver which maybe incorporated in the implanted energy-transforming device 1002 or beseparate there from.

The wireless control signal may include a frequency, amplitude, or phasemodulated signal or a combination thereof. Alternatively, the wirelesscontrol signal includes an analogue or a digital signal, or acombination of an analogue and digital signal. Alternatively, thewireless control signal comprises an electric or magnetic field, or acombined electric and magnetic field.

The wireless remote control may transmit a carrier signal for carryingthe wireless control signal. Such a carrier signal may include digital,analogue or a combination of digital and analogue signals. Where thecontrol signal includes an analogue or a digital signal, or acombination of an analogue and digital signal, the wireless remotecontrol preferably transmits an electromagnetic carrier wave signal forcarrying the digital or analogue control signals.

FIG. 35 illustrates the system of FIG. 34 in the form of a moregeneralized block diagram showing the apparatus 10, theenergy-transforming device 1002 powering the apparatus 10 via powersupply line 1003, and the external energy-transmission device 1004, Thepatient's skin 1005, generally shown by a vertical line, separates theinterior of the patient to the right of the line from the exterior tothe left of the line.

FIG. 36 shows an embodiment of the invention identical to that of FIG.35, except that a reversing device in the form of an electric switch1006 operable for example by polarized energy also is implanted in thepatient for reversing the apparatus 10. When the switch is operated bypolarized energy the wireless remote control of the externalenergy-transmission device 1004 transmits a wireless signal that carriespolarized energy and the implanted energy-transforming device 1002transforms the wireless polarized energy into a polarized current foroperating the electric switch 1006. When the polarity of the current isshifted by the implanted energy-transforming device 1002 the electricswitch 1006 reverses the function performed by the apparatus 10.

FIG. 37 shows an embodiment of the invention identical to that of FIG.35, except that an operation device 1007 implanted in the patient foroperating the apparatus 10 is provided between the implantedenergy-transforming device 1002 and the apparatus 10. This operationdevice can be in the form of a motor 1007, such as an electricservomotor. The motor 1007 is powered with energy from the implantedenergy-transforming device 1002, as the remote control of the externalenergy-transmission device 1004 transmits a wireless signal to thereceiver of the implanted energy-transforming device 1002.

FIG. 38 shows an embodiment of the invention identical to that of FIG.35, except that it also comprises an operation device in the form of anassembly 1008 including a motor/pump unit 1009 and a fluid reservoir1010 is implanted in the patient. In this case the apparatus 10 ishydraulically operated, i.e. hydraulic fluid is pumped by the motor/pumpunit 1009 from the fluid reservoir 1010 through a conduit 1011 to theapparatus 10 to operate the apparatus, and hydraulic fluid is pumped bythe motor/pump unit 1009 back from the apparatus 10 to the fluidreservoir 1010 to return the apparatus to a starting position. Theimplanted energy-transforming device 1002 transforms wireless energyinto a current, for example a polarized current, for powering themotor/pump unit 1009 via an electric power supply line 1012.

Instead of a hydraulically operated apparatus 10, it is also envisagedthat the operation device comprises a pneumatic operation device. Inthis case, the hydraulic fluid can be pressurized air to be used forregulation and the fluid reservoir is replaced by an air chamber.

In all of these embodiments the energy-transforming device 1002 mayinclude a rechargeable accumulator like a battery or a capacitor to becharged by the wireless energy and supplies energy for any energyconsuming part of the system.

As an alternative, the wireless remote control described above may bereplaced by manual control of any implanted part to make contact with bythe patient's hand most likely indirect, for example a press buttonplaced under the skin.

FIG. 39 shows an embodiment of the invention comprising the externalenergy-transmission device 1004 with its wireless remote control, theapparatus 10, in this case hydraulically operated, and the implantedenergy-transforming device 1002, and further comprising a hydraulicfluid reservoir 1013, a motor/pump unit 1009 and an reversing device inthe form of a hydraulic valve shifting device 1014, all implanted in thepatient. Of course the hydraulic operation could easily be performed byjust changing the pumping direction and the hydraulic valve may thereforbe omitted. The remote control may be a device separated from theexternal energy-transmission device or included in the same. The motorof the motor/pump unit 1009 is an electric motor. In response to acontrol signal from the wireless remote control of the externalenergy-transmission device 1004, the implanted energy-transformingdevice 1002 powers the motor/pump unit 1009 with energy from the energycarried by the control signal, whereby the motor/pump unit 1009distributes hydraulic fluid between the hydraulic fluid reservoir 1013and the apparatus 10. The remote control of the externalenergy-transmission device 1004 controls the hydraulic valve shiftingdevice 1014 to shift the hydraulic fluid flow direction between onedirection in which the fluid is pumped by the motor/pump unit 1009 fromthe hydraulic fluid reservoir 1013 to the apparatus 10 to operate theapparatus, and another opposite direction in which the fluid is pumpedby the motor/pump unit 1009 back from the apparatus 10 to the hydraulicfluid reservoir 1013 to return the apparatus to a starting position.

FIG. 40 shows an embodiment of the invention comprising the externalenergy-transmission device 1004 with its wireless remote control, theapparatus 10, the implanted energy-transforming device 1002, animplanted internal control unit 1015 controlled by the wireless remotecontrol of the external energy-transmission device 1004, an implantedaccumulator 1016 and an implanted capacitor 1017. The internal controlunit 1015 arranges storage of electric energy received from theimplanted energy-transforming device 1002 in the accumulator 1016, whichsupplies energy to the apparatus 10. In response to a control signalfrom the wireless remote control of the external energy-transmissiondevice 1004, the internal control unit 1015 either releases electricenergy from the accumulator 1016 and transfers the released energy viapower lines 1018 and 1019, or directly transfers electric energy fromthe implanted energy-transforming device 1002 via a power line 1020, thecapacitor 1017, which stabilizes the electric current, a power line 1021and the power line 1019, for the operation of the apparatus 10.

The internal control unit is preferably programmable from outside thepatient's body. In a preferred embodiment, the internal control unit isprogrammed to regulate the apparatus 10 according to a pre-programmedtime-schedule or to input from any sensor sensing any possible physicalparameter of the patient or any functional parameter of the system.

In accordance with an alternative, the capacitor 1017 in the embodimentof FIG. 40, 10 may be omitted. In accordance with another alternative,the accumulator 1016 in this embodiment may be omitted.

FIG. 41 shows an embodiment of the invention identical to that of FIG.35, except that a battery 1022 for supplying energy for the operation ofthe apparatus 10 and an electric switch 1023 for switching the operationof the apparatus 10 also are implanted in the patient. The electricswitch 1023 may be controlled by the remote control and may also beoperated by the energy supplied by the implanted energy-transformingdevice 1002 to switch from an off mode, in which the battery 1022 is notin use, to an on mode, in which the battery 1022 supplies energy for theoperation of the apparatus 10.

FIG. 42 shows an embodiment of the invention identical to that of FIG.41, except that an internal control unit 1015 controllable by thewireless remote control of the external energy-transmission device 1004also is implanted in the patient. In this case, the electric switch 1023is operated by the energy supplied by the implanted energy-transformingdevice 1002 to switch from an off mode, in which the wireless remotecontrol is prevented from controlling the internal control unit 1015 andthe battery is not in use, to a standby mode, in which the remotecontrol is permitted to control the internal control unit 1015 torelease electric energy from the battery 1022 for the operation of theapparatus 10.

FIG. 43 shows an embodiment of the invention identical to that of FIG.42, except that an accumulator 1016 is substituted for the battery 1022and the implanted components are interconnected differently. In thiscase, the accumulator 1016 stores energy from the implantedenergy-transforming device 1002. In response to a control signal fromthe wireless remote control of the external energy-transmission device1004, the internal control unit 1015 controls the electric switch 1023to switch from an off mode, in which the accumulator 1016 is not in use,to an on mode, in which the accumulator 1016 supplies energy for theoperation of the apparatus 10. The accumulator may be combined with orreplaced by a capacitor.

FIG. 44 shows an embodiment of the invention identical to that of FIG.43, except that a battery 1022 also is implanted in the patient and theimplanted components are interconnected differently. In response to acontrol signal from the wireless remote control of the externalenergy-transmission device 1004, the internal control unit 1015 controlsthe accumulator 1016 to deliver energy for operating the electric switch1023 to switch from an off mode, in which the battery 1022 is not inuse, to an on mode, in which the battery 1022 supplies electric energyfor the operation of the apparatus 10.

Alternatively, the electric switch 1023 may be operated by energysupplied by the accumulator 1016 to switch from an off mode, in whichthe wireless remote control is prevented from controlling the battery1022 to supply electric energy and is not in use, to a standby mode, inwhich the wireless remote control is permitted to control the battery1022 to supply electric energy for the operation of the apparatus 10.

It should be understood that the switch 1023 and all other switches inthis application should be interpreted in its broadest embodiment. Thismeans a transistor, MCU, MCPU, ASIC, FPGA or a DA converter or any otherelectronic component or circuit that may switch the power on and off.Preferably the switch is controlled from outside the body, oralternatively by an implanted internal control unit.

FIG. 45 shows an embodiment of the invention identical to that of FIG.41, except that a motor 1007, a mechanical reversing device in the formof a gear box 1024, and an internal control unit 1015 for controllingthe gear box 1024 also are implanted in the patient. The internalcontrol unit 1015 controls the gear box 1024 to reverse the functionperformed by the apparatus 10 (mechanically operated). Even simpler isto switch the direction of the motor electronically. The gear boxinterpreted in its broadest embodiment may stand for a servo arrangementsaving force for the operation device in favor of longer stroke to act.

FIG. 46 shows an embodiment of the invention identical to that of FIG.52 except that the implanted components are interconnected differently.Thus, in this case the internal control unit 1015 is powered by thebattery 1022 when the accumulator 1016, suitably a capacitor, activatesthe electric switch 1023 to switch to an on mode. When the electricswitch 1023 is in its on mode the internal control unit 1015 ispermitted to control the battery 1022 to supply, or not supply, energyfor the operation of the apparatus 10.

FIG. 47 schematically shows conceivable combinations of implantedcomponents of the apparatus for achieving various communication options.Basically, there are the apparatus 10, the internal control unit 1015,motor or pump unit 1009, and the external energy-transmission device1004 including the external wireless remote control. As alreadydescribed above the wireless remote control transmits a control signalwhich is received by the internal control unit 1015, which in turncontrols the various implanted components of the apparatus.

A feedback device, preferably comprising a sensor or measuring device1025, may be implanted in the patient for sensing a physical parameterof the patient. The physical parameter may be at least one selected fromthe group consisting of pressure, volume, diameter, stretching,elongation, extension, movement, bending, elasticity, musclecontraction, nerve impulse, body temperature, blood pressure, bloodflow, heartbeats and breathing. The sensor may sense any of the abovephysical parameters. For example, the sensor may be a pressure ormotility sensor. Alternatively, the sensor 1025 may be arranged to sensea functional parameter. The functional parameter may be correlated tothe transfer of energy for charging an implanted energy source and mayfurther include at least one selected from the group of parametersconsisting of; electricity, any electrical parameter, pressure, volume,diameter, stretch, elongation, extension, movement, bending, elasticity,temperature and flow.

The feedback may be sent to the internal control unit or out to anexternal control unit preferably via the internal control unit. Feedbackmay be sent out from the body via the energy transfer system or aseparate communication system with receiver and transmitters.

The internal control unit 1015, or alternatively the external wirelessremote control of the external energy-transmission device 1004, maycontrol the apparatus 10 in response to signals from the sensor 1025. Atransceiver may be combined with the sensor 1025 for sending informationon the sensed physical parameter to the external wireless remotecontrol. The wireless remote control may comprise a signal transmitteror transceiver and the internal control unit 1015 may comprise a signalreceiver or transceiver. Alternatively, the wireless remote control maycomprise a signal receiver or transceiver and the internal control unit1015 may comprise a signal transmitter or transceiver. The abovetransceivers, transmitters and receivers may be used for sendinginformation or data related to the apparatus 10 from inside thepatient's body to the outside thereof.

Where the motor/pump unit 1009 and battery 1022 for powering themotor/pump unit 1009 are implanted, information related to the chargingof the battery 1022 may be fed back. To be more precise, when charging abattery or accumulator with energy feed back information related to saidcharging process is sent and the energy supply is changed accordingly.

FIG. 48 shows an alternative embodiment wherein the apparatus 10 isregulated from outside the patient's body. The system 1000 comprises abattery 1022 connected to the apparatus 10 via a subcutaneous electricswitch 1026. Thus, the regulation of the apparatus 10 is performednon-invasively by manually pressing the subcutaneous switch, whereby theoperation of the apparatus 10 is switched on and off. It will beappreciated that the shown embodiment is a simplification and thatadditional components, such as an internal control unit or any otherpart disclosed in the present application can be added to the system.Two subcutaneous switches may also be used. In the preferred embodimentone implanted switch sends information to the internal control unit toperform a certain predetermined performance and when the patient pressthe switch again the performance is reversed.

FIG. 49 shows an alternative embodiment, wherein the system 1000comprises a hydraulic fluid reservoir 1013 hydraulically connected tothe apparatus. Non-invasive regulation is performed by manually pressingthe hydraulic reservoir connected to the apparatus. Alternatively, thehydraulic fluid reservoir 1013 is adapted to work with an injection portfor the injection of hydraulic fluid, preferably for calibration ofhydraulic fluid.

The system may include an external data communicator and an implantableinternal data communicator communicating with the external datacommunicator. The internal communicator feeds data related to theapparatus or the patient to the external data communicator and/or theexternal data communicator feeds data to the internal data communicator.

FIG. 50 schematically illustrates an arrangement of the system that iscapable of sending information from inside the patient's body to theoutside thereof to give feedback information related to at least onefunctional parameter of the apparatus or system, or related to aphysical parameter of the patient, in order to supply an accurate amountof energy to an implanted internal energy receiver 1002 connected toimplanted energy consuming components of the apparatus 10. Such anenergy receiver 1002 may include an energy source and/or anenergy-transforming device. Briefly described, wireless energy istransmitted from an external energy source 1004 a located outside thepatient and is received by the internal energy receiver 1002 locatedinside the patient. The internal energy receiver is adapted to directlyor indirectly supply received energy to the energy consuming componentsof the apparatus 10 via a switch 1026. An energy balance is determinedbetween the energy received by the internal energy receiver 1002 and theenergy used for the apparatus 10, and the transmission of wirelessenergy is then controlled based on the determined energy balance. Theenergy balance thus provides an accurate indication of the correctamount of energy needed, which is sufficient to operate the apparatus 10properly, but without causing undue temperature rise.

In FIG. 50 the patient's skin is indicated by a vertical line 1005.Here, the energy receiver comprises an energy-transforming device 1002located inside the patient, preferably just beneath the patient's skin1005. Generally speaking, the implanted energy-transforming device 1002may be placed in the abdomen, thorax, muscle fascia (e.g. in theabdominal wall), subcutaneously, or at any other suitable location. Theimplanted energy-transforming device 1002 is adapted to receive wirelessenergy E transmitted from the external energy-source 1004 a provided inan external energy-transmission device 1004 located outside thepatient's skin 1005 in the vicinity of the implanted energy-transformingdevice 1002.

As is well known in the art, the wireless energy E may generally betransferred by means of any suitable Transcutaneous Energy Transfer(TET) device, such as a device including a primary coil arranged in theexternal energy source 1004 a and an adjacent secondary coil arranged inthe implanted energy-transforming device 1002. When an electric currentis fed through the primary coil, energy in the form of a voltage isinduced in the secondary coil which can be used to power the implantedenergy consuming components of the apparatus, e.g. after storing theincoming energy in an implanted energy source, such as a rechargeablebattery or a capacitor. However, the present invention is generally notlimited to any particular energy transfer technique, TET devices orenergy sources, and any kind of wireless energy may be used.

The amount of energy received by the implanted energy receiver may becompared with the energy used by the implanted components of theapparatus. The term “energy used” is then understood to include alsoenergy stored by implanted components of the apparatus. A control deviceincludes an external control unit 1004 b that controls the externalenergy source 1004 a based on the determined energy balance to regulatethe amount of transferred energy. In order to transfer the correctamount of energy, the energy balance and the required amount of energyis determined by means of a determination device including an implantedinternal control unit 1015 connected between the switch 1026 and theapparatus 10. The internal control unit 1015 may thus be arranged toreceive various measurements obtained by suitable sensors or the like,not shown, measuring certain characteristics of the apparatus 10,somehow reflecting the required amount of energy needed for properoperation of the apparatus 10. Moreover, the current condition of thepatient may also be detected by means of suitable measuring devices orsensors, in order to provide parameters reflecting the patient'scondition. Hence, such characteristics and/or parameters may be relatedto the current state of the apparatus 10, such as power consumption,operational mode and temperature, as well as the patient's conditionreflected by parameters such as; body temperature, blood pressure,heartbeats and breathing. Other kinds of physical parameters of thepatient and functional parameters of the device are described elsewhere.

Furthermore, an energy source in the form of an accumulator 1016 mayoptionally be connected to the implanted energy-transforming device 1002via the control unit 1015 for accumulating received energy for later useby the apparatus 10. Alternatively or additionally, characteristics ofsuch an accumulator, also reflecting the required amount of energy, maybe measured as well. The accumulator may be replaced by a rechargeablebattery, and the measured characteristics may be related to the currentstate of the battery, any electrical parameter such as energyconsumption voltage, temperature, etc. In order to provide sufficientvoltage and current to the apparatus 10, and also to avoid excessiveheating, it is clearly understood that the battery should be chargedoptimally by receiving a correct amount of energy from the implantedenergy-transforming device 1002, i.e. not too little or too much. Theaccumulator may also be a capacitor with corresponding characteristics.

For example, battery characteristics may be measured on a regular basisto determine the current state of the battery, which then may be storedas state information in a suitable storage means in the internal controlunit 1015. Thus, whenever new measurements are made, the stored batterystate information can be updated accordingly. In this way, the state ofthe battery can be “calibrated” by transferring a correct amount ofenergy, so as to maintain the battery in an optimal condition.

Thus, the internal control unit 1015 of the determination device isadapted to determine the energy balance and/or the currently requiredamount of energy, (either energy per time unit or accumulated energy)based on measurements made by the above-mentioned sensors or measuringdevices of the apparatus 10, or the patient, or an implanted energysource if used, or any combination thereof. The internal control unit1015 is further connected to an internal signal transmitter 1027,arranged to transmit a control signal reflecting the determined requiredamount of energy, to an external signal receiver 1004 c connected to theexternal control unit 1004 b. The amount of energy transmitted from theexternal energy source 1004 a may then be regulated in response to thereceived control signal.

Alternatively, the determination device may include the external controlunit 1004 b. In this alternative, sensor measurements can be transmitteddirectly to the external control unit 1004 b wherein the energy balanceand/or the currently required amount of energy can be determined by theexternal control unit 1004 b, thus integrating the above-describedfunction of the internal control unit 1015 in the external control unit1004 b. In that case, the internal control unit 1015 can be omitted andthe sensor measurements are supplied directly to the internal signaltransmitter 1027 which sends the measurements over to the externalsignal receiver 1004 c and the external control unit 1004 b. The energybalance and the currently required amount of energy can then bedetermined by the external control unit 1004 b based on those sensormeasurements.

Hence, the present solution according to the arrangement of FIG. 50employs the feed back of information indicating the required energy,which is more efficient than previous solutions because it is based onthe actual use of energy that is compared to the received energy, e.g.with respect to the amount of energy, the energy difference, or theenergy receiving rate as compared to the energy rate used by implantedenergy consuming components of the apparatus. The apparatus may use thereceived energy either for consuming or for storing the energy in animplanted energy source or the like. The different parameters discussedabove would thus be used if relevant and needed and then as a tool fordetermining the actual energy balance. However, such parameters may alsobe needed per se for any actions taken internally to specificallyoperate the apparatus.

The internal signal transmitter 1027 and the external signal receiver1004 c may be implemented as separate units using suitable signaltransfer means, such as radio, IR (Infrared) or ultrasonic signals.Alternatively, the internal signal transmitter 1027 and the externalsignal receiver 1004 c may be integrated in the implantedenergy-transforming device 1002 and the external energy source 1004 a,respectively, so as to convey control signals in a reverse directionrelative to the energy transfer, basically using the same transmissiontechnique. The control signals may be modulated with respect tofrequency, phase or amplitude.

Thus, the feedback information may be transferred either by a separatecommunication system including receivers and transmitters or may beintegrated in the energy system. In accordance with the presentinvention, such an integrated information feedback and energy systemcomprises an implantable internal energy receiver for receiving wirelessenergy, the energy receiver having an internal first coil and a firstelectronic circuit connected to the first coil, and an external energytransmitter for transmitting wireless energy, the energy transmitterhaving an external second coil and a second electronic circuit connectedto the second coil. The external second coil of the energy transmittertransmits wireless energy which is received by the first coil of theenergy receiver. This system further comprises a power switch forswitching the connection of the internal first coil to the firstelectronic circuit on and off, such that feedback information related tothe charging of the first coil is received by the external energytransmitter in the form of an impedance variation in the load of theexternal second coil, when the power switch switches the connection ofthe internal first coil to the first electronic circuit on and off. Inimplementing this system in the arrangement of FIG. 50, the switch 1026is either separate and controlled by the internal control unit 1015, orintegrated in the internal control unit 1015. It should be understoodthat the switch 1026 should be interpreted in its broadest embodiment.This means a transistor, MCU, MCPU, ASIC FPGA or a DA converter or anyother electronic component or circuit that may switch the power on andoff.

To conclude, the energy supply arrangement illustrated in FIG. 50 mayoperate basically in the following manner. The energy balance is firstdetermined by the internal control unit 1015 of the determinationdevice. A control signal reflecting the required amount of energy isalso created by the internal control unit 1015, and the control signalis transmitted from the internal signal transmitter 1027 to the externalsignal receiver 1004 c. Alternatively, the energy balance can bedetermined by the external control unit 1004 b instead depending on theimplementation, as mentioned above. In that case, the control signal maycarry measurement results from various sensors. The amount of energyemitted from the external energy source 1004 a can then be regulated bythe external control unit 1004 b, based on the determined energybalance, e.g. in response to the received control signal. This processmay be repeated intermittently at certain intervals during ongoingenergy transfer, or may be executed on a more or less continuous basisduring the energy transfer.

The amount of transferred energy can generally be regulated by adjustingvarious transmission parameters in the external energy source 1004 a,such as voltage, current, amplitude, wave frequency and pulsecharacteristics.

This system may also be used to obtain information about the couplingfactors between the coils in a TET system even to calibrate the systemboth to find an optimal place for the external coil in relation to theinternal coil and to optimize energy transfer. Simply comparing in thiscase the amount of energy transferred with the amount of energyreceived. For example if the external coil is moved the coupling factormay vary and correctly displayed movements could cause the external coilto find the optimal place for energy transfer. Preferably, the externalcoil is adapted to calibrate the amount of transferred energy to achievethe feedback information in the determination device, before thecoupling factor is maximized.

This coupling factor information may also be used as a feedback duringenergy transfer. In such a case, the energy system of the presentinvention comprises an implantable internal energy receiver forreceiving wireless energy, the energy receiver having an internal firstcoil and a first electronic circuit connected to the first coil, and anexternal energy transmitter for transmitting wireless energy, the energytransmitter having an external second coil and a second electroniccircuit connected to the second coil. The external second coil of theenergy transmitter transmits wireless energy which is received by thefirst coil of the energy receiver. This system further comprises afeedback device for communicating out the amount of energy received inthe first coil as a feedback information, and wherein the secondelectronic circuit includes a determination device for receiving thefeedback information and for comparing the amount of transferred energyby the second coil with the feedback information related to the amountof energy received in the first coil to obtain the coupling factorbetween the first and second coils. The energy transmitter may regulatethe transmitted energy in response to the obtained coupling factor.

With reference to FIG. 51, although wireless transfer of energy foroperating the apparatus has been described above to enable non-invasiveoperation, it will be appreciated that the apparatus can be operatedwith wire bound energy as well. Such an example is shown in FIG. 51,wherein an external switch 1026 is interconnected between the externalenergy source 1004 a and an operation device, such as an electric motor1007 operating the apparatus 10. An external control unit 1004 bcontrols the operation of the external switch 1026 to effect properoperation of the apparatus 10.

FIG. 52 illustrates different embodiments for how received energy can besupplied to and used by the apparatus 10. Similar to the example of FIG.50, an internal energy receiver 1002 receives wireless energy E from anexternal energy source 1004 a which is controlled by a transmissioncontrol unit 1004 b. The internal energy receiver 1002 may comprise aconstant voltage circuit, indicated as a dashed box “constant V” in thefigure, for supplying energy at constant voltage to the apparatus 10.The internal energy receiver 1002 may further comprise a constantcurrent circuit, indicated as a dashed box “constant C” in the figure,for supplying energy at constant current to the apparatus 10.

The apparatus 10 comprises an energy consuming part 10 a, which may be amotor, pump, restriction device, or any other medical appliance thatrequires energy for its electrical operation. The apparatus 10 mayfurther comprise an energy storage device 10 b for storing energysupplied from the internal energy receiver 1002. Thus, the suppliedenergy may be directly consumed by the energy consuming part 10 a, orstored by the energy storage device 10 b, or the supplied energy may bepartly consumed and partly stored. The apparatus 10 may further comprisean energy stabilizing unit 10 c for stabilizing the energy supplied fromthe internal energy receiver 1002. Thus, the energy may be supplied in afluctuating manner such that it may be necessary to stabilize the energybefore consumed or stored.

The energy supplied from the internal energy receiver 1002 may furtherbe accumulated and/or stabilized by a separate energy stabilizing unit1028 located outside the apparatus 10, before being consumed and/orstored by the apparatus 10. Alternatively, the energy stabilizing unit1028 may be integrated in the internal energy receiver 1002. In eithercase, the energy stabilizing unit 1028 may comprise a constant voltagecircuit and/or a constant current circuit.

It should be noted that FIG. 50 and FIG. 52 illustrate some possible butnon-limiting implementation options regarding how the various shownfunctional components and elements can be arranged and connected to eachother. However, the skilled person will readily appreciate that manyvariations and modifications can be made within the scope of the presentinvention.

FIG. 53 schematically shows an energy balance measuring circuit of oneof the proposed designs of the system for controlling transmission ofwireless energy, or energy balance control system. The circuit has anoutput signal centered on 2.5V and proportionally related to the energyimbalance. The derivative of this signal shows if the value goes up anddown and how fast such a change takes place. If the amount of receivedenergy is lower than the energy used by implanted components of theapparatus, more energy is transferred and thus charged into the energysource. The output signal from the circuit is typically feed to an A/Dconverter and converted into a digital format. The digital informationcan then be sent to the external energy-transmission device allowing itto adjust the level of the transmitted energy. Another possibility is tohave a completely analog system that uses comparators comparing theenergy balance level with certain maximum and minimum thresholds sendinginformation to external energy-transmission device if the balance driftsout of the max/min window.

The schematic FIG. 53 shows a circuit implementation for a system thattransfers energy to the implanted energy components of the apparatus ofthe present invention from outside of the patient's body using inductiveenergy transfer. An inductive energy transfer system typically uses anexternal transmitting coil and an internal receiving coil. The receivingcoil, L1, is included in the schematic FIG. 36; the transmitting partsof the system are excluded.

The implementation of the general concept of energy balance and the waythe information is transmitted to the external energy transmitter can ofcourse be implemented in numerous different ways. The schematic FIG. 53and the above described method of evaluating and transmitting theinformation should only be regarded as examples of how to implement thecontrol system.

Circuit Details

In FIG. 53 the symbols Y1, Y2, Y3 and so on symbolize test points withinthe circuit. The components in the diagram and their respective valuesare values that work in this particular implementation which of courseis only one of an infinite number of possible design solutions.

Energy to power the circuit is received by the energy receiving coil L1.Energy to implanted components is transmitted in this particular case ata frequency of 25 kHz. The energy balance output signal is present attest point Y1.

Those skilled in the art will realize that the above various embodimentsof the system could be combined in many different ways. For example, theelectric switch 1006 of FIG. 36 could be incorporated in any of theembodiments of FIGS. 39-45, the hydraulic valve shifting device 1014 ofFIG. 39 could be incorporated in the embodiment of FIG. 38, and the gearbox 1024 could be incorporated in the embodiment of FIG. 37. Pleaseobserve that the switch simply could mean any electronic circuit orcomponent.

The embodiments described in connection with FIGS. 50, 52 and 53identify a method and a system for controlling transmission of wirelessenergy to implanted energy consuming components of an electricallyoperable apparatus. Such a method and system will be defined in generalterms in the following.

A method is thus provided for controlling transmission of wirelessenergy supplied to implanted energy consuming components of an apparatusas described above. The wireless energy E is transmitted from anexternal energy source located outside the patient and is received by aninternal energy receiver located inside the patient, the internal energyreceiver being connected to the implanted energy consuming components ofthe apparatus for directly or indirectly supplying received energythereto. An energy balance is determined between the energy received bythe internal energy receiver and the energy used for the apparatus. Thetransmission of wireless energy E from the external energy source isthen controlled based on the determined energy balance.

The wireless energy may be transmitted inductively from a primary coilin the external energy source to a secondary coil in the internal energyreceiver. A change in the energy balance may be detected to control thetransmission of wireless energy based on the detected energy balancechange. A difference may also be detected between energy received by theinternal energy receiver and energy used for the medical device, tocontrol the transmission of wireless energy based on the detected energydifference.

When controlling the energy transmission, the amount of transmittedwireless energy may be decreased if the detected energy balance changeimplies that the energy balance is increasing, or vice versa. Thedecrease/increase of energy transmission may further correspond to adetected change rate.

The amount of transmitted wireless energy may further be decreased ifthe detected energy difference implies that the received energy isgreater than the used energy, or vice versa. The decrease/increase ofenergy transmission may then correspond to the magnitude of the detectedenergy difference.

As mentioned above, the energy used for the medical device may beconsumed to operate the medical device, and/or stored in at least oneenergy storage device of the medical device.

When electrical and/or physical parameters of the medical device and/orphysical parameters of the patient are determined, the energy may betransmitted for consumption and storage according to a transmission rateper time unit which is determined based on said parameters. The totalamount of transmitted energy may also be determined based on saidparameters.

When a difference is detected between the total amount of energyreceived by the internal energy receiver and the total amount ofconsumed and/or stored energy, and the detected difference is related tothe integral over time of at least one measured electrical parameterrelated to said energy balance, the integral may be determined for amonitored voltage and/or current related to the energy balance.

When the derivative is determined over time of a measured electricalparameter related to the amount of consumed and/or stored energy, thederivative may be determined for a monitored voltage and/or currentrelated to the energy balance.

The transmission of wireless energy from the external energy source maybe controlled by applying to the external energy source electricalpulses from a first electric circuit to transmit the wireless energy,the electrical pulses having leading and trailing edges, varying thelengths of first time intervals between successive leading and trailingedges of the electrical pulses and/or the lengths of second timeintervals between successive trailing and leading edges of theelectrical pulses, and transmitting wireless energy, the transmittedenergy generated from the electrical pulses having a varied power, thevarying of the power depending on the lengths of the first and/or secondtime intervals.

In that case, the frequency of the electrical pulses may besubstantially constant when varying the first and/or second timeintervals. When applying electrical pulses, the electrical pulses mayremain unchanged, except for varying the first and/or second timeintervals. The amplitude of the electrical pulses may be substantiallyconstant when varying the first and/or second time intervals. Further,the electrical pulses may be varied by only varying the lengths of firsttime intervals between successive leading and trailing edges of theelectrical pulses.

A train of two or more electrical pulses may be supplied in a row,wherein when applying the train of pulses, the train having a firstelectrical pulse at the start of the pulse train and having a secondelectrical pulse at the end of the pulse train, two or more pulse trainsmay be supplied in a row, wherein the lengths of the second timeintervals between successive trailing edge of the second electricalpulse in a first pulse train and leading edge of the first electricalpulse of a second pulse train are varied.

When applying the electrical pulses, the electrical pulses may have asubstantially constant current and a substantially constant voltage. Theelectrical pulses may also have a substantially constant current and asubstantially constant voltage. Further, the electrical pulses may alsohave a substantially constant frequency. The electrical pulses within apulse train may likewise have a substantially constant frequency.

The circuit formed by the first electric circuit and the external energysource may have a first characteristic time period or first timeconstant, and when effectively varying the transmitted energy, suchfrequency time period may be in the range of the first characteristictime period or time constant or shorter.

A system comprising an apparatus as described above is thus alsoprovided for controlling transmission of wireless energy supplied toimplanted energy consuming components of the apparatus. In its broadestsense, the system comprises a control device for controlling thetransmission of wireless energy from an energy-transmission device, andan implantable internal energy receiver for receiving the transmittedwireless energy, the internal energy receiver being connected toimplantable energy consuming components of the apparatus for directly orindirectly supplying received energy thereto. The system furthercomprises a determination device adapted to determine an energy balancebetween the energy received by the internal energy receiver and theenergy used for the implantable energy consuming components of theapparatus, wherein the control device controls the transmission ofwireless energy from the external energy-transmission device, based onthe energy balance determined by the determination device.

In one embodiment at least one battery may be a part of or replace theenergy-transforming device 1002 to supply energy to the apparatus 10over a power supply line. In one embodiment the battery is notrechargeable. In an alternative embodiment the battery is rechargeable.The battery supply may of course be placed both remote to andincorporated in the device.

Further, the system may comprise any of the following:

-   -   A primary coil in the external energy source adapted to transmit        the wireless energy inductively to a secondary coil in the        internal energy receiver.    -   The determination device is adapted to detect a change in the        energy balance, and the control device controls the transmission        of wireless energy based on the detected energy balance change    -   The determination device is adapted to detect a difference        between energy received by the internal energy receiver and        energy used for the implantable energy consuming components of        the apparatus, and the control device controls the transmission        of wireless energy based on the detected energy difference.    -   The control device controls the external energy-transmission        device to decrease the amount of transmitted wireless energy if        the detected energy balance change implies that the energy        balance is increasing, or vice versa, wherein the        decrease/increase of energy transmission corresponds to a        detected change rate.    -   The control device controls the external energy-transmission        device to decrease the amount of transmitted wireless energy if        the detected energy difference implies that the received energy        is greater than the used energy, or vice versa, wherein the        decrease/increase of energy transmission corresponds to the        magnitude of said detected energy difference.    -   The energy used for the apparatus is consumed to operate the        apparatus, and/or stored in at least one energy storage device        of the apparatus.    -   Where electrical and/or physical parameters of the apparatus        and/or physical parameters of the patient are determined, the        energy-transmission device transmits the energy for consumption        and storage according to a transmission rate per time unit which        is determined by the determination device based on said        parameters. The determination device also determines the total        amount of transmitted energy based on said parameters.    -   When a difference is detected between the total amount of energy        received by the internal energy receiver and the total amount of        consumed and/or stored energy, and the detected difference is        related to the integral over time of at least one measured        electrical parameter related to the energy balance, the        determination device determines the integral for a monitored        voltage and/or current related to the energy balance.    -   When the derivative is determined over time of a measured        electrical parameter related to the amount of consumed and/or        stored energy, the determination device determines the        derivative for a monitored voltage and/or current related to the        energy balance.    -   The energy-transmission device comprises a coil placed        externally to the human body, and an electric circuit is        provided to power the external coil with electrical pulses to        transmit the wireless energy. The electrical pulses have leading        and trailing edges, and the electric circuit is adapted to vary        first time intervals between successive leading and trailing        edges and/or second time intervals between successive trailing        and leading edges of the electrical pulses to vary the power of        the transmitted wireless energy. As a result, the energy        receiver receiving the transmitted wireless energy has a varied        power.    -   The electric circuit is adapted to deliver the electrical pulses        to remain unchanged except varying the first and/or second time        intervals.    -   The electric circuit has a time constant and is adapted to vary        the first and second time intervals only in the range of the        first time constant, so that when the lengths of the first        and/or second time intervals are varied, the transmitted power        over the coil is varied.    -   The electric circuit is adapted to deliver the electrical pulses        to be varied by only varying the lengths of first time intervals        between successive leading and trailing edges of the electrical        pulses.    -   The electric circuit is adapted to supplying a train of two or        more electrical pulses in a row, said train having a first        electrical pulse at the start of the pulse train and having a        second electrical pulse at the end of the pulse train, and    -   the lengths of the second time intervals between successive        trailing edge of the second electrical pulse in a first pulse        train and leading edge of the first electrical pulse of a second        pulse train are varied by the first electronic circuit.    -   The electric circuit is adapted to provide the electrical pulses        as pulses having a substantially constant height and/or        amplitude and/or intensity and/or voltage and/or current and/or        frequency.    -   The electric circuit has a time constant, and is adapted to vary        the first and second time intervals only in the range of the        first time constant, so that when the lengths of the first        and/or second time intervals are varied, the transmitted power        over the first coil are varied.    -   The electric circuit is adapted to provide the electrical pulses        varying the lengths of the first and/or the second time        intervals only within a range that includes the first time        constant or that is located relatively close to the first time        constant, compared to the magnitude of the first time constant.

FIGS. 54-57 show in more detail block diagrams of four different ways ofhydraulically or pneumatically powering an implanted apparatus accordingto the invention.

FIG. 54 shows a system as described above with. The system comprises animplanted apparatus 10 and further a separate regulation reservoir 1013,a one way pump 1009 and an alternate valve 1014.

FIG. 55 shows the apparatus 10 and a fluid reservoir 1013. By moving thewall of the regulation reservoir or changing the size of the same in anyother different way, the adjustment of the apparatus may be performedwithout any valve, just free passage of fluid any time by moving thereservoir wall.

FIG. 56 shows the apparatus 10, a two way pump 1009 and the regulationreservoir 1013.

FIG. 57 shows a block diagram of a reversed servo system with a firstclosed system controlling a second closed system. The servo systemcomprises a regulation reservoir 1013 and a servo reservoir 1050. Theservo reservoir 1050 mechanically controls an implanted apparatus 10 viaa mechanical interconnection 1054. The apparatus has anexpandable/contactable cavity. This cavity is preferably expanded orcontracted by supplying hydraulic fluid from the larger adjustablereservoir 1052 in fluid connection with the apparatus 10. Alternatively,the cavity contains compressible gas, which can be compressed andexpanded under the control of the servo reservoir 1050.

The servo reservoir 1050 can also be part of the apparatus itself.

In one embodiment, the regulation reservoir is placed subcutaneous underthe patient's skin and is operated by pushing the outer surface thereofby means of a finger. This system is illustrated in FIGS. 58a-c . InFIG. 58a , a flexible subcutaneous regulation reservoir 1013 is shownconnected to a bulge shaped servo reservoir 1050 by means of a conduit1011. This bellow shaped servo reservoir 1050 is comprised in a flexibleapparatus 10. In the state shown in FIG. 58a , the servo reservoir 1050contains a minimum of fluid and most fluid is found in the regulationreservoir 1013. Due to the mechanical interconnection between the servoreservoir 1050 and the apparatus 10, the outer shape of the apparatus 10is contracted, i.e., it occupies less than its maximum volume. Thismaximum volume is shown with dashed lines in the figure.

FIG. 58b shows a state wherein a user, such as the patient in with theapparatus is implanted, presses the regulation reservoir 1013 so thatfluid contained therein is brought to flow through the conduit 1011 andinto the servo reservoir 1050, which, thanks to its bellow shape,expands longitudinally. This expansion in turn expands the apparatus 10so that it occupies its maximum volume, thereby stretching the stomachwall (not shown), which it contacts.

The regulation reservoir 1013 is preferably provided with means 1013 afor keeping its shape after compression. This means, which isschematically shown in the figure, will thus keep the apparatus 10 in astretched position also when the user releases the regulation reservoir.In this way, the regulation reservoir essentially operates as an on/offswitch for the system.

An alternative embodiment of hydraulic or pneumatic operation will nowbe described with reference to FIGS. 59 and 60 a-c. The block diagramshown in FIG. 59 comprises with a first closed system controlling asecond closed system. The first system comprises a regulation reservoir1013 and a servo reservoir 1050. The servo reservoir 1050 mechanicallycontrols a larger adjustable reservoir 1052 via a mechanicalinterconnection 1054. An implanted apparatus 10 having anexpandable/contactable cavity is in turn controlled by the largeradjustable reservoir 1052 by supply of hydraulic fluid from the largeradjustable reservoir 1052 in fluid connection with the apparatus 10.

An example of this embodiment will now be described with reference toFIG. 60a-c . Like in the previous embodiment, the regulation reservoiris placed subcutaneous under the patient's skin and is operated bypushing the outer surface thereof by means of a finger. The regulationreservoir 1013 is in fluid connection with a bellow shaped servoreservoir 1050 by means of a conduit 1011. In the first closed system1013, 1011, 1050 shown in FIG. 60a , the servo reservoir 1050 contains aminimum of fluid and most fluid is found in the regulation reservoir1013.

The servo reservoir 1050 is mechanically connected to a largeradjustable reservoir 1052, in this example also having a bellow shapebut with a larger diameter than the servo reservoir 1050. The largeradjustable reservoir 1052 is in fluid connection with the apparatus 10.This means that when a user pushes the regulation reservoir 1013,thereby displacing fluid from the regulation reservoir 1013 to the servoreservoir 1050, the expansion of the servo reservoir 1050 will displacea larger volume of fluid from the larger adjustable reservoir 1052 tothe apparatus 10. In other words, in this reversed servo, a small volumein the regulation reservoir is compressed with a higher force and thiscreates a movement of a larger total area with less force per area unit.

Like in the previous embodiment described above with reference to FIGS.58a-c , the regulation reservoir 1013 is preferably provided with means1013 a for keeping its shape after compression. This means, which isschematically shown in the figure, will thus keep the apparatus 10 in astretched position also when the user releases the regulation reservoir.In this way, the regulation reservoir essentially operates as an on/offswitch for the system.

Although the different parts described above have specific placements onthe drawings it should be understood that these placements might vary,depending on the application.

The lubricating fluid used in any of the embodiments herein ispreferably a biocompatible lubricating fluid imitating the synovialfluid of the natural hip joint. According to one embodiment thelubricating fluid is Hyaluronic acid.

In all of the embodiments above it is conceivable that the conduit isexcluded and that the channel or channels are in direct connection withthe reservoir or the injection port.

Please note that any embodiment or part of embodiment as well as anymethod or part of method could be combined in any way. All examplesherein should be seen as part of the general description and thereforpossible to combine in any way in general terms. Please note that thedescription in general should be seen as describing both of an apparatusand a method.

The various aforementioned features of the invention may be combined inany way if such combination is not clearly contradictory. Individualfeatures of the various embodiments may be combined or exchanged unlesssuch combination or exchange is clearly contradictory to the overallfunction of the device.

The invention claimed is:
 1. An implantable medical device, forimplantation in a mammal joint having an acetabulum surface, comprising:an artificial concave acetabulum surface, being a bowl shaped surfaceadapted to replace a surface of the acetabulum surface, wherein saidartificial concave acetabulum surface is adapted to be lubricated, whenimplanted in said joint, a reservoir comprising a pumping device and amovable wall portion for changing the volume of the reservoir, fornon-invasively transporting a lubricating fluid from said reservoir tosaid artificial acetabulum surface for lubricating said artificialacetabulum surface, at least one inlet adapted to receive saidlubricating fluid from the reservoir, at least one channel at leastpartly integrated in said artificial concave acetabulum surface, whereinthe channel is in fluid connection with said at least one inlet fordistributing said lubricating fluid to the surface of said artificialconcave surface, an implantable subcutaneous injection port forrefilling said reservoir, wherein the movable wall portion is moved whenthe reservoir is refilled, such that the volume of the reservoir isincreased, and wherein the implantable injection port is adapted toallow, by injection into the injection port, preloading of saidreservoir with pressurized lubricating fluid, and an interconnectingpart for connecting the reservoir and said artificial concave acetabulumsurface.
 2. The implantable medical device according to claim 1, whereinsaid at least one channel is adapted to distribute said lubricatingfluid to the surface of said artificial concave acetabulum surface ontwo or more portions of said artificial concave acetabulum surface forlubricating said artificial contacting surface.
 3. The implantablemedical device according to claim 1, wherein a plurality of channels areat least partly integrated in said artificial concave acetabulumsurface.
 4. The implantable medical device according to claim 1, whereinsaid pumping device comprises a pump adapted to pump said lubricatingfluid from said reservoir to said artificial concave acetabulum surfacefor lubricating said artificial acetabulum surface.
 5. The implantablemedical device according to claim 1, further comprising a valve adaptedto close the connection between said reservoir and said artificialsurface.
 6. The implantable medical device according to claim 1, whereinsaid reservoir is placed in a unit separate from said artificial surfaceand adapted to be connected to said artificial surface with a conduit.7. The implantable medical device according to claim 1, wherein saidpumping device comprises a motor.
 8. The implantable medical deviceaccording to claim 1, wherein said reservoir is adapted to be at leastone of: at least partly be placed inside of a bone of the patient, atleast partly be placed inside of the pelvic bone of the patient, placedsubcutaneously or in a cavity in the body, placed in the abdomen, andplaced subcutaneously or in a cavity in the body in a region of thepatient selected from a group of regions consisting of: the abdominalregion, the inguinal region, the pelvic region, and the thigh region. 9.The implantable medical device according to claim 1, wherein saidreservoir is adapted to provide a pressure to said lubricating fluid.10. The implantable medical device according to claim 9, wherein saidreservoir is at least one of: spring loaded, comprising a chamberadapted to hold a compressed gas, and comprising an elastic wall adaptedto create said pressure.
 11. The implantable medical device according toclaim 1, comprising a system for manually and non-invasively controllingthe implantable medical device, comprising at least one of; at least oneswitch implantable in the patient, a wireless remote control, and animplantable hydraulic reservoir which is hydraulically connected to theimplantable medical device and adapted to be regulated by manuallypressing the hydraulic reservoir.
 12. The implantable medical deviceaccording to claim 1, comprising a system comprising at least one of; aninternal energy source for powering implantable energy consumingcomponents of the implantable medical device, and an internal energyreceiver, and an adaptation to be energized non-invasively andwirelessly by an energy transmission device from outside the patient'sbody, adapted for sending wireless energy to at least one of: animplantable internal energy source comprised in the system, beingchargeable by the energy transferred from the energy transmissiondevice, and at least one implantable energy consuming component of thesystem being energized with the wireless energy.
 13. The implantablemedical device according to claim 1, comprising a system furthercomprising a sensor and/or a measuring device sensing or measuring atleast one of; at least one physical parameter of the patient, and atleast one functional parameter related to the implantable medicaldevice, comprising at least one of a functional parameter correlated tothe transfer of energy for charging an internal energy source, and afunctional parameter related to the implantable medical device, whereinthe implantable medical device further comprising a feedback device forsending feedback information from inside the patient's body to at leastone of; an implantable internal control unit comprised, an externalcontrol unit outside of the patient's body, an external control unitoutside of the patient's body, via the internal control unit, anexternal control unit outside of the patient's body, via the internalcontrol unit according to the programming of the internal control unitperformed by the external control unit, wherein the feedback informationbeing related to at least one of; the at least one physical parameter ofthe patient and the at least one functional parameter related to theimplantable medical device.
 14. The implantable medical device accordingto claim 1, wherein said reservoir is a pre-pressurized reservoir,adapted to move said lubricating fluid from said pre-pressurizedreservoir to said artificial concave acetabulum surface for lubricatingsaid artificial acetabulum surface.